docs: add developer, testing and performance guides; record M0 resultsv0.1.0

- DEVELOPER_GUIDE: workflow, how the tooling works (verified simulator
  behaviour), conventions and how to add devices.
- TESTING and PERFORMANCE: test layers, M0 results and measured numbers.
- FEASIBILITY: what M0 verified (watchdog 120k/240k, 10 MB storage in
  device profiles, unreliable monkeydo exit code, icon sizes).
- README status, new make targets and layout; CHANGELOG 0.1.0.
- Author/Summary headers on every document, including the original brief.

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

1 files changed, 30 insertions, 6 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6d7f149..acc2c9d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,16 +1,40 @@
+<!--
+  Author:  cirakg & claude ai
+  Summary: Notable changes per version, in Keep a Changelog format with semantic versioning.
+-->
 # Changelog
 
 All notable changes to this project are documented here. The format follows
 [Keep a Changelog](https://keepachangelog.com/en/1.1.0/), and the project uses
 [Semantic Versioning](https://semver.org/spec/v2.0.0.html). Versions stay at
-0.x until milestone M8.
+0.x until milestone M8; each milestone raises the minor version.
 
 ## [Unreleased]
 
+## [0.1.0] - 2026-10-18
+
+Milestone M0: scaffolding. Not useful on a watch yet; the app shows only its
+name and version.
+
 ### Added
 
-- Project plan (`README.md`) and Phase 0 feasibility findings (`docs/FEASIBILITY.md`).
-- M0 scaffolding: Docker development and documentation images with pinned
-  versions, a host `Makefile` that runs every step in Docker, interactive
-  Connect IQ SDK setup, developer key generation, headless simulator test
-  runner, and a minimal watch app with a smoke test.
+- Project plan (`README.md`), Phase 0 feasibility findings with what M0
+  verified (`docs/FEASIBILITY.md`), developer guide, testing and performance
+  documents.
+- Docker images with pinned versions: `garmin-otp/dev` (Ubuntu 22.04 snapshot,
+  Java 17, headless simulator stack, hash-locked Python tools,
+  checksum-verified SDK manager CLI) and `garmin-otp/docs` (Markdown lint and
+  Mermaid rendering).
+- `Makefile` running every step in hardened containers: no capabilities,
+  read-only root filesystem, only the project folder mounted, no network
+  outside image builds and `make sdk`, serial even under `make -j`.
+- `make sdk` (agreements, login, SDK 9.2.0, device files for 72 watches,
+  token deleted afterwards) and `make key` (RSA-4096 developer key).
+- Build pipeline with strict type checking and warnings as errors, per-size
+  launcher icons for all 72 products, unit tests in the headless simulator on
+  four devices, golden-image screenshot tests, start-up and memory budgets, and
+  the signed `.iq` package.
+- Python tools with 44 tests: test-log judge, screenshot checker, budget
+  checker, product rule checker, Markdown link checker, project linter (code
+  rules and the Author/Summary header rule) and icon generator.
+- A minimal watch app (home screen with name and version) and a smoke test.