feat(api): OSS-to-EE adoption migration on the EE chain

[jp-agenta]

Context

The chain split (#4680) makes an in-place OSS→EE switch structurally possible: point the EE stack at the OSS databases and run the EE runner. This PR adds the revision that makes it actually work — the EE chain's adoption migration. Design: docs/designs/oss-ee-convergence/migration-chains-and-edition-switch.md.

Changes

One conditional revision (e00000000003) on the EE-only chain:

• EE-origin database: every object exists, every backfill target is populated — complete no-op.
• OSS-origin database (edition switch): creates meters_type and the four EE-only tables (subscriptions, meters, organization_domains, organization_providers) in their canonical post-cleanup shapes (six nullable lifecycle columns, billing FKs anchored to organizations(id) ON DELETE CASCADE), then backfills one subscription per organization on the configured free plan (get_free_plan(), anchor = adoption day) and the USERS gauge recomputed from organization_members. Domains and providers start empty.

References only EE tables and forever-stable shared PKs, per the chain rules.

What to QA

Replay an OSS database to head, switch the stack to EE (same postgres, POSTGRES_URI_* pointing at the agenta_oss_* databases), run the EE runner: the schema dump afterwards should be identical to a fresh EE database's dump except data-bearing rows; running the runner twice must be a no-op.

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Project	Deployment	Actions	Updated (UTC)
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Updated at 2026-06-14T18:46:52.794Z