v0.9.53

Changelog

• 2020119 tests: Record the v0.9.52 launcher pin
• c1bfef2 docs: Remove superseded scratch proposals and stale task status
• 7c1e3c0 docs: Define coherent module-job execution contracts
• 3911671 docs: Bound module-job delivery to Phase 2
• 0c06447 docs: Clarify Phase 2 publication cadence
• 893a7c3 builds: Record and execute selected modules through Phase 2
• 11faaa0 docs: Preserve the superseded observer investigation

Release notes

• Server builds execute selected modules independently and include queued modules in
  build status; the overall build finishes after every selected module completes.
• Server tag builds publish images under the exact Git tag; branch builds only build.
• CLI build progress reports configuration, build-step, and publication phases.

🤖 Drafted by Codex on chakrit's behalf.