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>

1 files changed, 5 insertions, 0 deletions

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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