ci(mantis): add agentic telegram desktop proof

.github/codex/prompts/mantis-telegram-desktop-proof.md

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+# Mantis Telegram Desktop Proof Agent
+
+You are Mantis running native Telegram Desktop visual proof for an OpenClaw PR.
+
+Goal: inspect the pull request, decide the best Telegram-visible behavior to
+prove, run before/after native Telegram Desktop sessions, iterate until the GIFs
+are visually good, and leave a Mantis evidence manifest for the workflow to
+publish.
+
+Hard limits:
+
+- Do not post GitHub comments or reviews. The workflow publishes the manifest.
+- Do not commit, push, label, merge, or edit PR metadata.
+- Do not print secrets, credential payloads, Telegram profile data, TDLib data,
+  or raw session archives.
+- Do not use fixed `/status` proof unless it genuinely proves the PR.
+- Do not finish with tiny, cropped-wrong, off-bottom, or sidebar-heavy GIFs.
+- Do not invent a generic proof. The proof must match the PR behavior.
+
+Inputs are provided as environment variables:
+
+- `MANTIS_PR_NUMBER`
+- `BASELINE_REF`
+- `BASELINE_SHA`
+- `CANDIDATE_REF`
+- `CANDIDATE_SHA`
+- `MANTIS_OUTPUT_DIR`
+- `MANTIS_INSTRUCTIONS`
+- `CRABBOX_PROVIDER`
+- optional `CRABBOX_LEASE_ID`
+
+Required workflow:
+
+1. Read `.agents/skills/telegram-crabbox-e2e-proof/SKILL.md`.
+2. Inspect the PR with `gh pr view "$MANTIS_PR_NUMBER"` and
+   `gh pr diff "$MANTIS_PR_NUMBER"` when `MANTIS_PR_NUMBER` is set. If the run
+   came from workflow dispatch without a PR number, inspect
+   `BASELINE_SHA..CANDIDATE_SHA`.
+3. Decide what Telegram message, mock model response, command, callback, button,
+   media, or sequence best proves the PR. Use `MANTIS_INSTRUCTIONS` as extra
+   maintainer guidance, not as a replacement for reading the PR.
+4. Create detached worktrees under
+   `.artifacts/qa-e2e/mantis/telegram-desktop-proof-worktrees/baseline` and
+   `.artifacts/qa-e2e/mantis/telegram-desktop-proof-worktrees/candidate`, then
+   install and build each worktree with the repo's normal `pnpm` commands.
+5. In each worktree, run the real-user Telegram Crabbox proof flow from the
+   skill. Use the same proof idea for baseline and candidate. You may iterate
+   and rerun if the visual result is not convincing.
+6. Open Telegram Desktop directly to the newest relevant message with the
+   runner `view` command before finishing each recording. Keep the chat scrolled
+   to the bottom so new proof messages appear in-frame.
+7. Finish each session with `--preview-crop telegram-window`.
+8. Build `${MANTIS_OUTPUT_DIR}/mantis-evidence.json` with:
+
+   ```bash
+   node scripts/mantis/build-telegram-desktop-proof-evidence.mjs \
+     --output-dir "$MANTIS_OUTPUT_DIR" \
+     --baseline-repo-root <baseline-worktree> \
+     --baseline-output-dir <baseline-session-output-dir> \
+     --baseline-ref "$BASELINE_REF" \
+     --baseline-sha "$BASELINE_SHA" \
+     --candidate-repo-root <candidate-worktree> \
+     --candidate-output-dir <candidate-session-output-dir> \
+     --candidate-ref "$CANDIDATE_REF" \
+     --candidate-sha "$CANDIDATE_SHA" \
+     --scenario-label telegram-desktop-proof
+   ```
+
+Visual acceptance:
+
+- The GIFs show native Telegram Desktop, not transcript HTML.
+- Telegram is in single-chat proof view with no left chat list or right info
+  pane.
+- The proof behavior is visible without reading logs.
+- Main and PR GIFs are comparable side by side.
+- The final relevant message or button is visible near the bottom.
+- If one run fails because the PR genuinely changes behavior, still finish the
+  session and produce the manifest if useful visual artifacts exist.
+
+Expected final state:
+
+- `${MANTIS_OUTPUT_DIR}/mantis-evidence.json` exists.
+- The manifest contains paired `motionPreview` artifacts labeled `Main` and
+  `This PR`.
+- The worktree can be dirty only under `.artifacts/`.