chore(aiwg): add T3MP3ST maintainer addon

.aiwg/addons/t3mp3st-maintainer/README.md

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+# T3MP3ST Maintainer Addon
+
+Project-local AIWG addon for running T3MP3ST repository maintenance with
+repeatable quality gates. It captures the maintainer process for PR audits,
+merge trains, issue response, and release-readiness checks.
+
+## What this is
+
+This bundle is intentionally project-local. It encodes the way this repository
+should be stewarded now that maintainers are responsible for the full queue, not
+only their own PRs.
+
+Use it when:
+
+- Auditing all open PRs before a merge session.
+- Reviewing one PR to maintainer standards.
+- Running a merge train one PR at a time with CI and issue closure checks.
+- Triaging open issues into close, comment, address, defer, or feature-track
+  actions.
+
+## Layout
+
+```
+.aiwg/addons/t3mp3st-maintainer/
+├── manifest.json
+├── README.md
+├── agents/
+├── capabilities/
+└── skills/
+```
+
+## Skills
+
+- `t3mp3st-queue-audit` — classify the whole PR/issue queue before touching it.
+- `t3mp3st-pr-audit` — audit a single PR with current checkout and GitHub state.
+- `t3mp3st-merge-train` — merge validated PRs one at a time with post-merge
+  checks.
+- `t3mp3st-issue-steward` — triage and respond to open issues without jumping
+  straight to implementation.
+
+## Agents
+
+- `t3mp3st-maintainer-steward`
+- `t3mp3st-pr-auditor`
+- `t3mp3st-issue-steward`
+- `t3mp3st-release-integrator`
+
+## Flows
+
+- `t3mp3st-pr-audit-flow`
+- `t3mp3st-merge-train-flow`
+- `t3mp3st-issue-steward-flow`
+
+## Usage
+
+Discover and inspect:
+
+```bash
+aiwg discover "t3mp3st merge train"
+aiwg show skill t3mp3st-merge-train
+aiwg discover "t3mp3st pr audit"
+aiwg show skill t3mp3st-pr-audit
+```
+
+Deploy to configured providers:
+
+```bash
+aiwg use t3mp3st-maintainer
+aiwg doctor --project-local
+```