docs(release): add v0.19.0 notes and assets manifest

Author: BunsDev

docs/releases/v0.19.0.md

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+# OK Code v0.19.0
+
+## Highlights
+- Release workflow hardening and release-pipeline reliability fixes.
+- Git/PR flow fixes to stop stale branch metadata from hijacking push and PR creation.
+- Release-preflight fixes for server snapshot decoding and exact optional property checks.
+
+## Changes
+- Improved release workflow resilience around staged release documentation and optional CLI publishing.
+- Fixed snapshot query handling for thread `githubRef` data.
+- Fixed `wsServer.ts` type issues blocking strict server typecheck.
+- Fixed formatting drift and release-preflight blockers discovered during rollout.
+
+## Desktop downloads
+See the attached assets on this GitHub Release.
+
+## Notes
+- This release includes release-process fixes landed during the rollout itself.

docs/releases/v0.19.0/assets.md

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+# OK Code v0.19.0 Assets
+
+This release contains:
+- macOS (arm64): `.dmg` and updater manifests where applicable
+- Linux (x64): `.AppImage`
+- Windows (x64): `.exe`
+- Bundled release documentation artifacts:
+  - `okcode-RELEASE-NOTES.md`
+  - `okcode-CHANGELOG.md`
+  - `okcode-ASSETS-MANIFEST.md`