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gsxdsm ae507afc37 FN-9131: Add PostgreSQL harness budget characterization

Characterize cluster-shared PostgreSQL connection admission while keeping regressive harness wiring disabled.

- add advisory-lock slot budgeting, bootstrap gating, and local allocation accounting
- cover budget arithmetic, queueing, degradation, and PostgreSQL lock behavior
- document loaded-lane failures and the terminal-negative lifecycle boundary
- clarify that the active harness neither admits nor clamps against the experimental budget

Files changed:
 .../test-failures/pg-harness-connection-budget.md  |  21 +
 .../suite-only-flakes-observed-register.md         |   2 +
 docs/testing.md                                    |   6 +
 .../__tests__/pg-connection-budget.test.ts         | 146 ++++++
 .../src/__test-utils__/pg-connection-budget.ts     | 492 +++++++++++++++++++++
 .../core/src/__test-utils__/pg-test-harness.ts     |   8 +
 .../postgres/pg-connection-budget.pg.test.ts       |  36 ++
 7 files changed, 711 insertions(+)

Fusion-Task-Id: FN-9131

Fusion-Task-Lineage: c83611ad-95f9-44ef-a0fd-1f182a26725d

Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

2026-08-16 19:29:05 -07:00