feat: show cutoff-known post body beside the live rewrite (v2.1.0)

[seonghobae]

Buyer impact

Opening a title marked Updated after cutoff now shows the body that run knew beside the live rewrite. After make seed, open Lineage reconstruction · Succeeded · Demo Corp, then Demo public post: Body this run knew is the January follow-up; the live body names the later delivery window. Compare those two texts. Demo private post stays unmarked and has no second text.

Scope

• Migration 0024_source_post_revision.sql (ADR 0025) stores each title/body rewrite as a half-open valid-time interval. Clock-only updates do not pretend to be a rewrite.
• GET /api/posts/{id}?as_of= returns known_at when a revision covers that clock. The live post_body stays the live row. A missing cover is omitted — never a fabricated cutoff sentence.
• Analysis-run detail stays titles and clocks. The known body is only on the opened post.
• Seed writes the January Demo public sentence, then rewrites it on 2026-01-13.
• No TEPP theta is invented.

Base

Rebased onto #74 exact head d4d1048 (v2.0.0, includes #216). Do not merge before #74. Do not mix leftover pairs (#211) or #215 into this branch. Do not add commits to #74 or #92.

Review

Do not self-approve. Squash-merge only with independent current-head APPROVE and exact-head required success.

Verify

uv run --extra dev python -m pytest tests/test_source_post_revision.py tests/test_analysis_run_registry_schema.py tests/test_analysis_run_reconstruction_schema.py -q
cd frontend && pnpm run lint && pnpm run test

Frontend: oxlint clean, 67 passed. Python contract tests: 6 passed (16 skipped without local Postgres).

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