feat: retain analysis-run registry prototype as superseded evidence

[seonghobae]

Superseded by clean canonical delivery in #85

This branch established the right additive direction and valuable PostgreSQL tests, but concurrent branch-only repair writers left multiple temporary workflows/scripts and repeatedly changing structural contracts on the same head. It also began with the analysis knowledge cutoff on the reusable snapshot, nullable requester identity, globally scoped idempotency, and an append-only event bag without a serialized legal state machine.

PR #85 is the clean canonical replacement on the same reviewed #74 product line. It preserves the unique value of this branch while resolving the product contracts in one coherent schema:

• snapshot-owned evidence availability and capture time;
• run-owned knowledge cutoff;
• non-null real user_account requester;
• idempotency scoped to the authenticated account;
• immutable snapshot, aggregate, and run-request evidence;
• one shared snapshot-row lock order for count freeze versus first run;
• pending-first, contiguous, monotonic, legal status transitions and terminal finality;
• fail-closed rollback, current-status view, 3NF, and descriptive database-object names;
• no temporary repair workflow or script in the intended final diff.

This PR is closed without deleting its branch so its research, tests, rollback concepts, and repair history remain available for audit. Do not merge or reopen it alongside #85; that would create competing migration 0018 and ADR 0013 authorities.

Superseded by #85. Refs #79.

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[seonghobae]

@cwl-noema-review @opencode-agent

Please perform an independent review-only assessment of exact head 899f99d4dd2ddd61032e8091cc48975fc9795f29. Verify migrations 0018/0019, temporal leakage, snapshot/count locking, account-scoped idempotency, run/scope immutability, lifecycle transition enforcement, rollback replay safety, 3NF/naming, public-content exclusions, and the current claim boundary. Do not push changes or treat stacked-parent evidence as merge approval.