[repo-assist] Add DeepWiki MCP tool + guidance and fix 4 triage bugs (supersedes #50962, #50963) [skip ci]

[blozano-tt]

Summary

This PR combines and supersedes two open repo-assist PRs so there is a single coherent repo-assist.md source and one clean gh aw compile to test against:

• Supersedes [repo-assist] Add DeepWiki MCP tool for cross-repo grounding #50962 — DeepWiki MCP tool + cross-repo grounding guidance
• Supersedes [repo-assist] Fix new-contributor detection, firewall boilerplate, stale-issue triage & double-commenting #50963 — 4 triage-logic bug fixes from the first live run

Why combine them

.github/workflows/repo-assist.lock.yml is a deterministic function of the whole .github/workflows/repo-assist.md source (both its frontmatter_hash and body_hash are recomputed on every compile). Each of the two PRs changed both hashes, so merging them independently would have one PR's lock regeneration clobber the other's. Per @wilder's request, they are merged here into one source file and compiled once so the workflow can be manually tested end-to-end against a single lock.

What's included

DeepWiki MCP tool + guidance (from #50962)

• Adds a read-only DeepWiki MCP server (https://mcp.deepwiki.com/mcp) scoped to read_wiki_structure, read_wiki_contents, ask_question. No new write permissions — purely an additional read-only tool.
• New body section "Using DeepWiki (cross-repo grounding)": use it to orient across the sibling repos the runner can't easily clone (tt-metal, tt-umd, tt-kmd, tt-isa-documentation), with a strict verify-before-asserting discipline — anything load-bearing must be confirmed against current code via bash/gh, never asserted from DeepWiki alone.
• Memory guidance: cache pointers, not frozen facts — store dated, re-derivable notes ("ask DeepWiki about X; last checked ") rather than pasting DeepWiki answers that drift.

Triage-logic fixes (from #50963)

1. New-contributor welcome (Task 7) now requires verified zero merged PRs and zero prior issues/comments (via GitHub search) before welcoming — no longer inferring "new" from local context/memory.
2. Firewall boilerplate — adds an instruction to strip the benign ⚠️ Firewall blocked … awmgmcpg block from public comments. awmgmcpg is gh-aw's own internal MCP-gateway sidecar; it cannot be silenced via network.allowed at this compiler version (confirmed dead end, documented in a frontmatter NOTE), so it's handled at the instruction level.
3. Fresh-issue scoping (Task 1/2) — first-time comment+label triage is restricted to issues active in ~90 days, and [HELP]/question issues no longer default to the bug label.
4. Comment dedup (Task 7 + Anti-spam) — when both a triage comment (Task 2) and a welcome (Task 7) apply to the same issue in one run, they are combined into a single comment instead of two.

Compile / testing notes

• repo-assist.lock.yml was regenerated once with gh aw compile on the combined source using gh-aw v0.82.14 — the exact compiler_version pinned in the base main lock's gh-aw-metadata. Result: 0 errors, 0 warnings, and a second compile is byte-identical (deterministic). The lock diff reflects only real content changes (DeepWiki added to the MCP gateway config + GH_AW_ALLOWED_DOMAINS, updated gh-aw-metadata hashes). The .lock.yml is generated — please don't hand-edit; regenerate via gh aw compile repo-assist.
• Suggested manual test: trigger /repo-assist <a cross-repo question> (e.g. something about tt-umd device init) on a test issue. One run then exercises both change-sets: the DeepWiki tool for cross-repo grounding, and the fixed contributor-detection / labeling / comment-dedup behavior.

Once this is verified and merged, #50962 and #50963 are being closed in favor of it.

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[Copilot]

Pull request overview

Adds DeepWiki cross-repository grounding and refines Repo Assist triage behavior.

Changes:

• Adds a read-only DeepWiki MCP server and verification guidance.
• Tightens contributor detection, issue triage, and comment deduplication.
• Regenerates the compiled workflow lock.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
.github/workflows/repo-assist.md	Configures DeepWiki and updates triage instructions.
.github/workflows/repo-assist.lock.yml	Regenerates the executable workflow configuration.

Comments suppressed due to low confidence (1)

.github/workflows/repo-assist.md:354

• [🟡] Bug: Prompt text cannot suppress the generated firewall footer

In gh-aw v0.82.14, actions/setup/js/messages_footer.cjs:654-673 reads blocked domains and appends the warning after the agent-produced content. This instruction only controls what the agent submits, so the awmgmcpg warning will still be attached to every public safe output.

Why it matters: the firewall-boilerplate bug advertised as fixed by this PR will reproduce unchanged on the next run. The fix must suppress this internal hostname in gh-aw's footer generation (or upgrade to a release that does) and then regenerate the lock file.

- **Never forward firewall boilerplate into comments**: do not copy or reproduce any `⚠️ Firewall blocked …` warning block (e.g. the benign `awmgmcpg` MCP-gateway notice) into issue/PR comments or descriptions. `awmgmcpg` is gh-aw's own internal MCP Gateway sidecar hostname, not a real missing dependency, and it cannot be silenced via `network.allowed` at the current compiler version (see the NOTE in the frontmatter). Treat any such block as internal-only noise and strip it from anything you post publicly.

[blozano-tt]

🤖 Repo Assist — review comments addressed

Went through the review feedback on this PR. 1 unresolved review comment (from the Copilot reviewer); no human inline comments or issue comments were open.

#	Reviewer	Comment	Resolution
1	copilot-pull-request-reviewer	🟡 Apply the 90-day gate to Task 1 labels — the freshness restriction lived only in Task 2, so Task 1 could still first-time-label stale issues	Fixed in d60813b3

What changed (.github/workflows/repo-assist.md):

• Task 1 — Triage and Label Open Issues: first-time labelling is now scoped to issues active in ~90 days, mirroring Task 2. Stale issues (no activity in ~90 days) no longer get a cold first-time label; correcting/removing an already-wrong label stays allowed on any issue.
• Guidelines → "Systematic": clarified that oldest-first cursor processing still respects the freshness gate, so reaching a stale issue in cursor order does not license a first-time comment or label (this covers the secondary "line 354" pointer in the review).

Lock regeneration: .github/workflows/repo-assist.lock.yml was recompiled with gh aw compile on gh-aw v0.82.14 (the pinned compiler_version). frontmatter_hash unchanged, body_hash updated, and a second compile is byte-identical — deterministic, per the compile discipline in the PR description. Result: 0 errors, 0 warnings.

Nothing was pushed back on — the single comment was a correct catch. The thread has been resolved.

[blozano-tt]

/codeowners bypass

[tenstorrent-github-bot]

✅ CodeOwners bypass approval granted by @blozano-tt (metalium-developers-infra team)

[tenstorrent-github-bot]

✅ CodeOwners Bypass Approval Granted

This PR has been approved by @blozano-tt (metalium-developers-infra team) using the bypass mechanism.

⚠️ Note: This bypass should only be used for emergency fixes or when standard approval process is blocked.