Add manual GitHub Release build workflow (build-release.yml)

[Wewoc]

Summary

• build_all.py: script body wrapped in main() (identical behavior, now importable) so build_all_github.py can call it.
• build_venv.py: ensure_build_venv() now honors an optional GLA_BUILD_VENV_DIR env var, falling back to the existing build_manifest.BUILD_VENV_DIR (D:\Garmin\.venv_gla) when unset — local builds are completely unaffected, CI sets it to a runner-owned path instead.
• build_all_github.py (new, CI-only): runs build_all.main() unchanged (tests + Target 2 + Target 3 + post-build validation); only on success, publishes a GitHub Release (tag vX.Y.Z from version.py) with the four build outputs (Garmin_Local_Archive.zip[.sha256], Garmin_Local_Archive_Standalone.zip[.sha256]) as assets. Release notes default to the HEAD commit's message body, overridable via a workflow_dispatch input. Never imported by any local build script.
• .github/workflows/build-release.yml (new): workflow_dispatch-only — manual, one click, not every push cuts a release. Inputs: prerelease (bool, also controls whether it's marked "Latest") and an optional release-notes override.
• D:\Garmin\.venv_gla on windows-latest feasibility already confirmed via build-venv-probe.yml (separate, already-merged probe).

Test plan

• All four files verified with python -m py_compile / yaml.safe_load
• Trigger build-release.yml via workflow_dispatch after merge, confirm the full build + Release publish succeeds

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https://claude.ai/code/session_01JYLx9STTgfo9KXLC2Gog3g

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📥 Commits

Reviewing files that changed from the base of the PR and between b942a55 and 8ff950e.

📒 Files selected for processing (4)

• .github/workflows/build-release.yml
• src/compiler/build_all.py
• src/compiler/build_all_github.py
• src/compiler/build_venv.py

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