Establish exact PostgreSQL connection identities and leases - #1754
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Pool reuse now uses an opaque process-local HMAC of the complete connection contract: driver generation, target, credentials, TLS, pool policy, purpose, and checkout behavior.
acquirePgPooladds an idempotent lease; leased pools survive LRU/TTL eviction, capacity admission fails when no pool can be safely reclaimed, and teardown awaits detached disposals. The compatibilitygetPgPoolAPI and database cleanup aliases remain available.This PR now contains only connection identity and lease ownership. The original notification role/broker commits and runtime credential commits are split into separate stacked PRs. It stays on #1752 and preserves the default checkout sanitation contract.
Validation: pg-cache 43 tests, pg-env 5 tests, and 13 real PostgreSQL sanitation/request-context tests passed. Both affected packages build as CJS/ESM; the frozen install passed. Full CI passed all 17 jobs on
f2bcd121cd566bd5c53d9c12571d69cb62ee14e2.Landing order: #1744 → #1752 → this PR → notification broker #1820 → runtime wiring. Runtime wiring additionally depends on #1747's awaited service release. No PR in this stack is merged by this task.
Refs constructive-io/constructive-planning#1693 (F01).
Runtime wiring is now split into #1821, stacked on #1820, with an explicit #1747 release prerequisite.