Persist WeChat draft audit evidence

[leether]

What changed

• persist audit.log and structured push-result.json after draft/get verification
• return relay evidence to the local article version directory before reporting success
• update exactly one CATALOG row while retaining superseded media ids
• add relay-backed draft reconciliation with ambiguity-safe disappearance and separate cover-gap reporting

Why

A six-article batch produced only stdout audit output. Later draft rebuilds invalidated the catalog ids, while manual MP publication consumed two drafts. The old completion boundary treated API acceptance as complete before durable evidence and backlinks agreed.

Impact

Post-side-effect failures now return explicit partial outcomes. Draft disappearance is never auto-classified as publication when freepublish is unavailable.

Checks

• npm run check
• bash scripts/privacy-check.sh
• relay-backed read-only reconciliation against the xz WeKnora catalog: 4 matched, 0 stale/invalid, 2 uncataloged, 3 selected cover gaps
• xz consumer CI: 24 canonical articles, 9 historical warnings

Change-ID: CHANGE-20260717-WECHAT-AUDIT-PERSISTENCE

[leether]

Closure completed.

• merged as 2de1ae31adee7e5e564a09163383373ea32eaa79
• PR checks passed: validate, privacy-check
• post-merge main checks passed: Lint run 29555156077, Privacy Gate run 29555156051
• remote task branch deleted
• local task worktree removed
• local task branch deleted after verifying de6120097... is contained in origin/main
• admin merge reason: ordinary merge was branch-policy blocked and repository auto-merge was disabled; the PR was MERGEABLE, all CI was green, and the user had explicitly authorized merge/closure

The primary /Users/lize/workspace/md2wechat checkout was deliberately not fast-forwarded because six unrelated uncommitted files overlap this merge. Git refused --ff-only; those user changes were left untouched. This is local-main alignment residue, not task-branch residue.

No real WeChat draft or visible publication was created in this closure round.