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gsxdsm 76cecacddd FN-8451: prevent embedded Postgres double starts

Prevent TaskStore boot collisions when an existing PostgreSQL pid file cannot yet be parsed.

- Read live postmaster pid files asynchronously with bounded retries.
- Fail closed when a present pid file has no readable port.
- Cover join, unreadable pid, and fresh-start lifecycle paths.

Files changed:
 packages/core/src/__tests__/postgres/embedded-lifecycle.test.ts | 119 +++++++++++++++++++++
 packages/core/src/postgres/embedded-lifecycle.ts                |  49 ++++++---
 2 files changed, 155 insertions(+), 13 deletions(-)

Fusion-Task-Id: FN-8451

Fusion-Task-Lineage: 823a874d-97ef-4380-97ce-e41981f660ff

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

2026-07-21 10:33:28 -07:00