feat(facts): add canonical relation transaction ports

[777genius]

Add feature-owned generic fact relation commands, snapshots, transaction ports and adapters over the existing canonical PostgreSQL rows. Link/list/unlink share the fact UoW, preserving replay, visibility, filtering and lifecycle rules without fact revisions or projection events.

The independent P1 review exposed an existing exact-thread FK requirement. The adapter now persists thread_id for same-thread endpoints, including global/global. Global/thread and different-thread links are rejected before replay or writes. This corrects the earlier inaccurate cross-thread allowance claim; no migration or schema expansion is introduced. Temporal integrity remains unchanged.

Validation: initial 140 functional and 67 architecture tests passed, followed by 52 focused remediation tests. Final disposable PostgreSQL acceptance passed in 11.02 seconds at 18f20e4, covering database contention, uniqueness, replay, rollback and extended thread cases. The temporary container was removed. Filter-before-limit and shared canonical rollback assertions were strengthened. Ruff and size checks passed.

Full CI passed before the bounded thread correction at 271b221 (34287913910). The complete final patch is byte-identical before and after rebase onto current main. Per owner request for quick stable delivery without long repeated checks or hosting load, reuse previous full CI plus focused correction evidence; no final exact-head full-suite pass is claimed. Final independent review approved exact commit 18f20e4 with no actionable P0/P1/P2 findings.

This persistence/application checkpoint does not switch HTTP consumers or complete all feature canonicalization. No further feature work, provider calls or dependencies are included.

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