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Ayaan Zaidi 0933263f76 fix(mantis): publish proof comments on auto-triggered runs (#127787)
## What Problem This Solves

Auto-triggered Mantis proof runs (label/`clawsweeper_label` and other non-comment request sources) end with no PR comment at all. The durable evidence publisher runs with `--create-missing false` and only edits an existing marker comment, but the inline status comment carrying that marker was only created when `request_source == 'issue_comment'`. Label-triggered runs therefore published nothing and logged the misleading "Skipped stale Mantis QA evidence comment because its status is no longer active" — observed on PR #127735. This is the silent-failure class: a Mantis run completes and the PR shows no visible outcome.

## Why This Change Was Made

- `.github/workflows/mantis-telegram-desktop-proof.yml`: the status ack comment (👀 + active-job link + run-scoped marker) is now created for every request source that resolves to a PR (`pr_number != ''`), not only `issue_comment`. The 👀 *reaction* stays `issue_comment`-only (it lives in `mantis-resolve-request.yml`, untouched — there is no triggering comment to react to on label runs).
- The start-failure fallback comment and the existing-artifact republish path now use the same run-scoped marker `<!-- mantis-telegram-desktop-proof:${GITHUB_RUN_ID}-${GITHUB_RUN_ATTEMPT} -->` as the status comment and the main publisher, so every publisher edits the single run-owned comment (ack → progress → final proof; no comment spam). The republish path gets an explicit `--create-missing false` to match. The design invariant that makes `false` safe: the fallback status-comment step is not `continue-on-error`, so a run in which no marker comment could be created fails `resolve_request` and never reaches publish.
- `scripts/mantis/publish-pr-evidence.mjs`: the two skip cases now log honestly — "no existing comment found" vs "could not update existing comment" — instead of one misleading stale-status message.

## User Impact

Operators triggering Mantis via labels (ClawSweeper flows) now get the same single evolving PR comment as comment-triggered runs: an immediate 👀 ack with the running job link, edited in place into the final proof evidence. No more runs that finish invisibly.

## Evidence

- Focused suite: `node scripts/run-vitest.mjs test/scripts/mantis-telegram-desktop-proof-workflow.test.ts` — 28/28, including new assertions that the status/failure comment gates use `pr_number != ''` (and not `request_source`) and that both publishers pass the run-scoped marker with `--create-missing false`.
- `node scripts/check-changed.mjs -- <touched files>` green; `git diff --check` clean.
- Marker alignment verified across all five sites in the workflow (status comment, prior-attempt cleanup regex, fallback comment, failure report, both publisher invocations): all use `mantis-telegram-desktop-proof:${GITHUB_RUN_ID}-${GITHUB_RUN_ATTEMPT}`.
- Live-run proof of the label-triggered path requires a merged workflow (GitHub runs the workflow from the default branch for these triggers), so the first post-merge label-triggered Mantis run is the live verification; stated here as the known evidence gap.

Production LOC delta: −4 (workflow/tooling); tests +13.
2026-08-22 11:10:11 +05:30
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