[anth-volk]

This PR replaces the draft-only Git source pin on microcosm-emitter with the exact PyPI release 0.2.1. It was the last item in docs/orrery-publication.md's "Deferred migration prerequisites", and it was Microcosm's only Git-pinned dependency.

The previous pin, commit 12624a1, had diverged from the emitter's main. It lacks PolicyEngine/microcosm-emitter#11 (bounded service startup) and the final concurrency fixes from #9. 0.2.1 contains both. The emitter's release workflow published it with trusted publishing: every merge to the emitter's main now publishes a new version automatically.

Changes

• packages/microcosm-build/pyproject.toml: microcosm-emitter==0.2.1, and the [tool.uv.sources] Git override is removed.
• uv.lock: regenerated. Only the microcosm-emitter entries change: the registry source, plus the wheel and source archive with hashes. The emitter's dependencies are unchanged, and no other package moved.
• APPROVED_UV_LOCK_SHA256 in microcosm.build.us_runtime.worker_identity now holds the new lockfile digest (6b32bcb1…).
• docs/orrery-publication.md: "Deferred migration prerequisites" is replaced by "Emitter dependency" (how to adopt a new release) and "Migrating an existing workstation" (the unchanged queue-upgrade guidance).

Compatibility

• Microcosm imports start_services, GraphPublicationClient, default_spool_path, publish_graph, publication_inventory, the publication contracts, LocalTelemetryEmitter, TelemetryRun, DEFAULT_HEARTBEAT_SECONDS and SERVICE_START_WARNING.
• Between 12624a1 and 0.2.1, none of those names or their parameters changed. The only addition is a phase field on the startup-failure diagnostic.
• The startup timeout already matches the emitter's 0.2.1 default. UK local release: nation-grain doctrine at K=15 and 2,000 epochs, a 100,000-household release path, line-scoped gate exclusions, and the QRF tail surface #1242 raised Microcosm's adapter default from 3 to 15 seconds, the same value as the emitter's new STARTUP_TIMEOUT from microcosm-emitter#11.

Validation (local, macOS, Python 3.14)

• uv sync --all-packages --locked installs microcosm-emitter 0.2.1, and uv run ruff check . passes.
• Tests: the emitter-adapter, UK full-build, FRS spine and UK Orrery publication tests, plus the engine-free US worker-identity tests, gave 1,545 passed and 8 skipped, with 1 deselected. test_uk_orrery_publication.py alone also passed (15).
• After rebasing onto main at 1cfbf7d8, uv lock --check and Ruff passed, the lockfile digest still matched APPROVED_UV_LOCK_SHA256, and test_emitter_adapter.py with test_uk_orrery_publication.py passed (34).
• test_spawned_workers_score_identically_to_sequential_cli can't run on the local interpreter. tools/score_us_release_head_to_head.py refuses --worker-max-slices on Python 3.14.6 ("replacing a recycled worker can deadlock the pool"). That guard checks only the interpreter version, so it is unrelated to this change. CI runs it.
• Not run locally: the country-engine jobs and the wheels job. CI runs them.

No new runtime variable, credential or service is introduced.

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