Phase 2: adopt shared Verify for AutoTalk

[VolkerChristian]

Phase 2: shared Python/native profile

• Add canonical read-only shared Verify caller and build-only manifest.
• Remove obsolete duplicated native-builds.yml (no simultaneous old/new implementation).
• Preserve Python 3.12 on Ubuntu 24.04, Windows 2025 and macOS 15, editable dev install, non-audio-device pytest selection, native package build, packaged smoke launch and archive/checksum uploads. Matrix fail-fast stays disabled.

Verified locally: Linux Python 3.12 package build and packaged smoke launch. Existing source is unchanged.

Outstanding: full Linux pytest currently hangs in prepared-playback qualification without a headless audio backend; the maintainer explicitly deferred this investigation; it is neither skipped nor marked green. Windows/macOS native qualification remains required. Existing workflow run already fails macOS, with the other platforms cancelled. The maintainer explicitly deferred test fixes to later work; tests remain enabled. The draft is held for the shared-workflow release, not a claimed application test fix.

Coordination — do not merge yet

Depends on control PR #2, followed by the maintainer publishing its reviewed shared-workflow version and moving the existing v1.0 in SNodeC/.github. The existing v1.0 has now been moved to the merged control commit; callers use @v1.0. Only the existing control workflow tag was moved with explicit approval; no new version tag was created. The seven-line read-only Verify caller remains the proposed template. Build details live only in .snodec/repo.yml.

No package workflow/pipeline, secrets, stable release tags, licences, default-branch names, other repositories' READMEs or upstream forks are changed. README frames remain Phase 4. This is a draft migration, not a claim that Phase 2's default-branch gate is achieved.

Approved tag-reference update

The maintainer explicitly requested moving the already existing workflow tag rather than creating v1. The existing v1.0 tag in SNodeC/.github now points to merged control/tag-reference PR #3 (8914a66cb34ae0fe003ff9d0fe5a69dadfcc3060). The canonical template and all callers use @v1.0. No v1 tag was created and no Book-* tag was changed. CodexUI/AutoTalk test fixes remain explicitly deferred, with tests enabled.