feat(spike): add the M1 settings spike app and make targets

A separate throwaway app (own app ID, no permissions) that shows what the
Garmin Connect app delivers per settings field and writes values back, to
measure the undocumented settings limits on the real phone and watch.
Includes length-marked test strings, `make spike` / `make spike-sim`,
`make vectors`, and step-by-step instructions in docs/SETTINGS_SPIKE.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

13 files changed, 177 insertions, 0 deletions

diff --git a/spike/settings/test-strings/index.html b/spike/settings/test-strings/index.html
new file mode 100644
index 0000000..d330b52
--- /dev/null
+++ b/spike/settings/test-strings/index.html
@@ -0,0 +1,30 @@
+<!doctype html>
+<!-- Author:  cirakg & claude ai -->
+<!-- Summary: Settings spike test strings with copy buttons; open on the phone, copy, paste into a settings field. -->
+<html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1">
+<title>Settings spike test strings</title>
+<style>body{font-family:sans-serif;margin:16px}textarea{width:100%;font-family:monospace}
+button{font-size:1.1em;padding:6px 16px;margin:4px 0 16px}</style></head>
+<body><h1>Settings spike test strings</h1>
+<p>Tap Copy, then paste into one of the Text fields in the app settings. Expected lengths are in each heading.</p>
+<section><h2>100 characters</h2><textarea id="len-0100" readonly rows="3">N=100|abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrP0050stuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghEND</textarea><button onclick="copyText('len-0100')">Copy</button></section>
+<section><h2>255 characters</h2><textarea id="len-0255" readonly rows="3">N=255|abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrP0050stuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkP0100lmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdP0150efghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwP0200xyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrEND</textarea><button onclick="copyText('len-0255')">Copy</button></section>
+<section><h2>256 characters</h2><textarea id="len-0256" readonly rows="3">N=256|abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrP0050stuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkP0100lmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdP0150efghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwP0200xyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrsEND</textarea><button onclick="copyText('len-0256')">Copy</button></section>
+<section><h2>500 characters</h2><textarea id="len-0500" readonly rows="3">N=500|abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrP0050stuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkP0100lmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdP0150efghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwP0200xyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopP0250qrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghiP0300jklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabP0350cdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuP0400vwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnP0450opqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdEND</textarea><button onclick="copyText('len-0500')">Copy</button></section>
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+<section><h2>8000 characters</h2><textarea id="len-8000" readonly 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rstuvwxyzP5000abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrsP5050tuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklP5100mnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdeP5150fghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxP5200yzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqP5250rstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijP5300klmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcP5350defghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvP5400wxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnoP5450pqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghP5500ijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzaP5550bcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstP5600uvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmP5650nopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefP5700ghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyP5750zabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrP5800stuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkP5850lmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdP5900efghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwP5950xyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopP6000qrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghiP6050jklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabP6100cdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuP6150vwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnP6200opqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefgP6250hijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzP6300abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrsP6350tuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklP6400mnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdeP6450fghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxP6500yzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqP6550rstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijP6600klmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcP6650defghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvP6700wxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnoP6750pqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghP6800ijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzaP6850bcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstP6900uvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmP6950nopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefP7000ghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyP7050zabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrP7100stuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkP7150lmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdP7200efghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwP7250xyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopP7300qrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghiP7350jklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabP7400cdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuP7450vwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnP7500opqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefgP7550hijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzP7600abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrsP7650tuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklP7700mnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdeP7750fghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxP7800yzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqP7850rstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijP7900klmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcP7950defghijklmnopqrstuvwxyzabcdefghijklmnopqrsEND</textarea><button onclick="copyText('len-8000')">Copy</button></section>
+<section><h2>special characters</h2><textarea id="special" readonly rows="3">special: &amp; &lt; &gt; \ &quot; { } % | non-ASCII: äöü ß € 😀 | otpauth://totp/Fake:alice?secret=JBSWY3DPEHPK3PXP&amp;issuer=Fake&amp;digits=6 | {&quot;name&quot;:&quot;Fake&quot;,&quot;path&quot;:&quot;a\/b&quot;} END</textarea><button onclick="copyText('special')">Copy</button></section>
+<script>
+function copyText(id) {
+  const area = document.getElementById(id);
+  area.select();
+  const done = () => alert("Copied " + area.value.length + " characters");
+  if (navigator.clipboard && window.isSecureContext) {
+    navigator.clipboard.writeText(area.value).then(done, () => { document.execCommand("copy"); done(); });
+  } else { document.execCommand("copy"); done(); }
+}
+</script></body></html>
diff --git a/spike/settings/test-strings/len-0100.txt b/spike/settings/test-strings/len-0100.txt
new file mode 100644
index 0000000..a4f972e
--- /dev/null
+++ b/spike/settings/test-strings/len-0100.txt
@@ -0,0 +1,5 @@
+# Author:  cirakg & claude ai
+# Summary: Settings spike test string: 100 characters.
+# Copy ONLY the last line (the test string) into a settings field.
+
+N=100|abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrP0050stuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghEND
diff --git a/spike/settings/test-strings/len-0255.txt b/spike/settings/test-strings/len-0255.txt
new file mode 100644
index 0000000..b8cc080
--- /dev/null
+++ b/spike/settings/test-strings/len-0255.txt
@@ -0,0 +1,5 @@
+# Author:  cirakg & claude ai
+# Summary: Settings spike test string: 255 characters.
+# Copy ONLY the last line (the test string) into a settings field.
+
+N=255|abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrP0050stuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkP0100lmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdP0150efghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwP0200xyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrEND
diff --git a/spike/settings/test-strings/len-0256.txt b/spike/settings/test-strings/len-0256.txt
new file mode 100644
index 0000000..bbd0ca2
--- /dev/null
+++ b/spike/settings/test-strings/len-0256.txt
@@ -0,0 +1,5 @@
+# Author:  cirakg & claude ai
+# Summary: Settings spike test string: 256 characters.
+# Copy ONLY the last line (the test string) into a settings field.
+
+N=256|abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrP0050stuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkP0100lmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdP0150efghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwP0200xyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrsEND
diff --git a/spike/settings/test-strings/len-0500.txt b/spike/settings/test-strings/len-0500.txt
new file mode 100644
index 0000000..80f5d25
--- /dev/null
+++ b/spike/settings/test-strings/len-0500.txt
@@ -0,0 +1,5 @@
+# Author:  cirakg & claude ai
+# Summary: Settings spike test string: 500 characters.
+# Copy ONLY the last line (the test string) into a settings field.
+
+N=500|abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrP0050stuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkP0100lmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdP0150efghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwP0200xyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopP0250qrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghiP0300jklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabP0350cdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuP0400vwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnP0450opqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdEND
diff --git a/spike/settings/test-strings/len-0800.txt b/spike/settings/test-strings/len-0800.txt
new file mode 100644
index 0000000..bc90b28
--- /dev/null
+++ b/spike/settings/test-strings/len-0800.txt
@@ -0,0 +1,5 @@
+# Author:  cirakg & claude ai
+# Summary: Settings spike test string: 800 characters.
+# Copy ONLY the last line (the test string) into a settings field.
+
+N=800|abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrP0050stuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkP0100lmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdP0150efghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwP0200xyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopP0250qrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghiP0300jklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabP0350cdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuP0400vwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnP0450opqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefgP0500hijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzP0550abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrsP0600tuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklP0650mnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdeP0700fghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxP0750yzabcdefghijklmnopqrstuvwxyzabcdefghijklmnEND
diff --git a/spike/settings/test-strings/len-0801.txt b/spike/settings/test-strings/len-0801.txt
new file mode 100644
index 0000000..38ef08d
--- /dev/null
+++ b/spike/settings/test-strings/len-0801.txt
@@ -0,0 +1,5 @@
+# Author:  cirakg & claude ai
+# Summary: Settings spike test string: 801 characters.
+# Copy ONLY the last line (the test string) into a settings field.
+
+N=801|abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrP0050stuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkP0100lmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdP0150efghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwP0200xyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopP0250qrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghiP0300jklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabP0350cdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuP0400vwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnP0450opqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefgP0500hijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzP0550abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrsP0600tuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklP0650mnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdeP0700fghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxP0750yzabcdefghijklmnopqrstuvwxyzabcdefghijklmnoEND
diff --git a/spike/settings/test-strings/len-1000.txt b/spike/settings/test-strings/len-1000.txt
new file mode 100644
index 0000000..0979c3c
--- /dev/null
+++ b/spike/settings/test-strings/len-1000.txt
@@ -0,0 +1,5 @@
+# Author:  cirakg & claude ai
+# Summary: Settings spike test string: 1000 characters.
+# Copy ONLY the last line (the test string) into a settings field.
+
+N=1000|abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqP0050rstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijP0100klmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcP0150defghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvP0200wxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnoP0250pqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghP0300ijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzaP0350bcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstP0400uvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmP0450nopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefP0500ghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyP0550zabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrP0600stuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkP0650lmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdP0700efghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwP0750xyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopP0800qrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghiP0850jklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabP0900cdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuP0950vwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkEND
diff --git a/spike/settings/test-strings/len-2000.txt b/spike/settings/test-strings/len-2000.txt
new file mode 100644
index 0000000..0358ab2
--- /dev/null
+++ b/spike/settings/test-strings/len-2000.txt
@@ -0,0 +1,5 @@
+# Author:  cirakg & claude ai
+# Summary: Settings spike test string: 2000 characters.
+# Copy ONLY the last line (the test string) into a settings field.
+
+N=2000|abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqP0050rstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijP0100klmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcP0150defghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvP0200wxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnoP0250pqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghP0300ijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzaP0350bcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstP0400uvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmP0450nopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefP0500ghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyP0550zabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrP0600stuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkP0650lmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdP0700efghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwP0750xyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopP0800qrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghiP0850jklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabP0900cdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuP0950vwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnP1000opqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefgP1050hijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzP1100abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrsP1150tuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklP1200mnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdeP1250fghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxP1300yzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqP1350rstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijP1400klmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcP1450defghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvP1500wxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnoP1550pqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghP1600ijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzaP1650bcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstP1700uvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmP1750nopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefP1800ghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyP1850zabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrP1900stuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkP1950lmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzaEND
diff --git a/spike/settings/test-strings/len-4000.txt b/spike/settings/test-strings/len-4000.txt
new file mode 100644
index 0000000..934e0d5
--- /dev/null
+++ b/spike/settings/test-strings/len-4000.txt
@@ -0,0 +1,5 @@
+# Author:  cirakg & claude ai
+# Summary: Settings spike test string: 4000 characters.
+# Copy ONLY the last line (the test string) into a settings field.
+
+N=4000|abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqP0050rstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijP0100klmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcP0150defghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvP0200wxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnoP0250pqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghP0300ijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzaP0350bcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstP0400uvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmP0450nopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefP0500ghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyP0550zabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrP0600stuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkP0650lmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdP0700efghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwP0750xyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopP0800qrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghiP0850jklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabP0900cdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuP0950vwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnP1000opqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefgP1050hijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzP1100abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrsP1150tuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklP1200mnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdeP1250fghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxP1300yzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqP1350rstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijP1400klmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcP1450defghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvP1500wxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnoP1550pqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghP1600ijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzaP1650bcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstP1700uvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmP1750nopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefP1800ghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyP1850zabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrP1900stuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkP1950lmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdP2000efghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwP2050xyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopP2100qrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghiP2150jklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabP2200cdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuP2250vwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnP2300opqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefgP2350hijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzP2400abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrsP2450tuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklP2500mnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdeP2550fghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxP2600yzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqP2650rstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijP2700klmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcP2750defghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvP2800wxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnoP2850pqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghP2900ijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzaP2950bcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstP3000uvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmP3050nopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefP3100ghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyP3150zabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrP3200stuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkP3250lmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdP3300efghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwP3350xyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopP3400qrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghiP3450jklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabP3500cdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuP3550vwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnP3600opqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefgP3650hijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzP3700abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrsP3750tuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklP3800mnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdeP3850fghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxP3900yzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqP3950rstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefgEND
diff --git a/spike/settings/test-strings/len-8000.txt b/spike/settings/test-strings/len-8000.txt
new file mode 100644
index 0000000..1f75f8d
--- /dev/null
+++ b/spike/settings/test-strings/len-8000.txt
@@ -0,0 +1,5 @@
+# Author:  cirakg & claude ai
+# Summary: Settings spike test string: 8000 characters.
+# Copy ONLY the last line (the test string) into a settings field.
+
+N=8000|abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqP0050rstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijP0100klmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcP0150defghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvP0200wxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnoP0250pqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghP0300ijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzaP0350bcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstP0400uvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmP0450nopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefP0500ghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyP0550zabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrP0600stuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkP0650lmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdP0700efghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwP0750xyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopP0800qrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghiP0850jklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabP0900cdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuP0950vwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnP1000opqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefgP1050hijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzP1100abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrsP1150tuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklP1200mnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdeP1250fghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxP1300yzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqP1350rstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijP1400klmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcP1450defghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvP1500wxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnoP1550pqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghP1600ijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzaP1650bcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstP1700uvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmP1750nopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefP1800ghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyP1850zabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrP1900stuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkP1950lmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdP2000efghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwP2050xyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopP2100qrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghiP2150jklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabP2200cdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuP2250vwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnP2300opqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefgP2350hijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzP2400abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrsP2450tuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklP2500mnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdeP2550fghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxP2600yzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqP2650rstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijP2700klmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcP2750defghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvP2800wxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnoP2850pqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghP2900ijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzaP2950bcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstP3000uvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmP3050nopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefP3100ghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyP3150zabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrP3200stuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkP3250lmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdP3300efghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwP3350xyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopP3400qrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghiP3450jklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabP3500cdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuP3550vwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnP3600opqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefgP3650hijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzP3700abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrsP3750tuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklP3800mnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdeP3850fghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxP3900yzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqP3950rstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijP4000klmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcP4050defghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvP4100wxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnoP4150pqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghP4200ijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzaP4250bcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstP4300uvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmP4350nopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefP4400ghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyP4450zabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrP4500stuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkP4550lmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdP4600efghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwP4650xyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopP4700qrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghiP4750jklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabP4800cdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuP4850vwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnP4900opqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefgP4950hijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxy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diff --git a/spike/settings/test-strings/make_test_strings.py b/spike/settings/test-strings/make_test_strings.py
new file mode 100644
index 0000000..8d43977
--- /dev/null
+++ b/spike/settings/test-strings/make_test_strings.py
@@ -0,0 +1,92 @@
+#!/usr/bin/env python3
+# Author:  cirakg & claude ai
+# Summary: Generate the settings-spike test strings: one .txt per string and an index.html with copy buttons.
+"""Generate the test strings for the M1 settings spike (docs/SETTINGS_SPIKE.md).
+
+Length strings look like
+    N=1000|abcdef...P0050...P0100...xyzEND
+"N=<length>|" says how long the string should be, a marker "P<position>"
+sits at every 50th character, and "END" closes it. If the phone app cuts a
+string, the watch shows a wrong length and no "END"; the last marker it shows
+tells roughly where the cut happened. Only letters, digits, "=", "|" are
+used, so the length tests don't also test character handling.
+
+special.txt holds the characters that may be rejected (& < > \\ " { } %),
+non-ASCII text, a fake otpauth URI and a JSON fragment.
+
+Usage: python3 make_test_strings.py   (writes into its own folder)
+"""
+
+from __future__ import annotations
+
+import html
+from pathlib import Path
+
+LENGTHS = (100, 255, 256, 500, 800, 801, 1000, 2000, 4000, 8000)
+SPECIAL = (
+    'special: & < > \\ " { } % | non-ASCII: äöü ß € 😀 | '
+    "otpauth://totp/Fake:alice?secret=JBSWY3DPEHPK3PXP&issuer=Fake&digits=6 | "
+    '{"name":"Fake","path":"a\\/b"} END'
+)
+HEADER = (
+    "# Author:  cirakg & claude ai\n# Summary: {summary}\n"
+    "# Copy ONLY the last line (the test string) into a settings field.\n\n"
+)
+LETTERS = "abcdefghijklmnopqrstuvwxyz"
+
+
+def marker_string(length: int) -> str:
+    """A string of exactly `length` characters with position markers."""
+    text = f"N={length}|"
+    i = 0
+    while len(text) < length - 3:
+        pos = len(text)
+        if pos % 50 == 0 and pos + 5 <= length - 3:
+            text += f"P{pos:04d}"
+        else:
+            text += LETTERS[i % len(LETTERS)]
+            i += 1
+    text += "END"
+    assert len(text) == length, (length, len(text))
+    return text
+
+
+def main() -> None:
+    here = Path(__file__).resolve().parent
+    entries = [(f"len-{n:04d}", f"{n} characters", marker_string(n)) for n in LENGTHS]
+    entries.append(("special", "special characters", SPECIAL))
+    for name, label, value in entries:
+        (here / f"{name}.txt").write_text(HEADER.format(summary=f"Settings spike test string: {label}.") + value + "\n")
+    cards = "\n".join(
+        f"<section><h2>{html.escape(label)}</h2>"
+        f'<textarea id="{name}" readonly rows="3">{html.escape(value)}</textarea>'
+        f"<button onclick=\"copyText('{name}')\">Copy</button></section>"
+        for name, label, value in entries
+    )
+    page = f"""<!doctype html>
+<!-- Author:  cirakg & claude ai -->
+<!-- Summary: Settings spike test strings with copy buttons; open on the phone, copy, paste into a settings field. -->
+<html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1">
+<title>Settings spike test strings</title>
+<style>body{{font-family:sans-serif;margin:16px}}textarea{{width:100%;font-family:monospace}}
+button{{font-size:1.1em;padding:6px 16px;margin:4px 0 16px}}</style></head>
+<body><h1>Settings spike test strings</h1>
+<p>Tap Copy, then paste into one of the Text fields in the app settings. Expected lengths are in each heading.</p>
+{cards}
+<script>
+function copyText(id) {{
+  const area = document.getElementById(id);
+  area.select();
+  const done = () => alert("Copied " + area.value.length + " characters");
+  if (navigator.clipboard && window.isSecureContext) {{
+    navigator.clipboard.writeText(area.value).then(done, () => {{ document.execCommand("copy"); done(); }});
+  }} else {{ document.execCommand("copy"); done(); }}
+}}
+</script></body></html>
+"""
+    (here / "index.html").write_text(page)
+    print(f"wrote {len(entries)} test strings and index.html into {here}")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/spike/settings/test-strings/special.txt b/spike/settings/test-strings/special.txt
new file mode 100644
index 0000000..38d0d79
--- /dev/null
+++ b/spike/settings/test-strings/special.txt
@@ -0,0 +1,5 @@
+# Author:  cirakg & claude ai
+# Summary: Settings spike test string: special characters.
+# Copy ONLY the last line (the test string) into a settings field.
+
+special: & < > \ " { } % | non-ASCII: äöü ß € 😀 | otpauth://totp/Fake:alice?secret=JBSWY3DPEHPK3PXP&issuer=Fake&digits=6 | {"name":"Fake","path":"a\/b"} END