docs(aiwg): add maintainer output templates

.aiwg/addons/t3mp3st-maintainer/templates/merge-train-report.md

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+---
+name: merge-train-report
+description: Maintainer merge-session report with per-PR gates, merge results, issue reconciliation, stop reasons, and next candidate.
+---
+
+# Merge Train Report
+
+Date: `<YYYY-MM-DD>`
+Repository: `elder-plinius/T3MP3ST`
+Operator: `<maintainer>`
+Method default: `<squash | merge | rebase>`
+
+## Preflight
+
+- Queue audit source: `<date/link/summary>`
+- Local branch: `<branch>`
+- Main baseline: `<sha>`
+- GitHub auth: `<confirmed/not confirmed>`
+
+## Merged
+
+| PR | Title | Head SHA | Method | Checks | Linked Issues | Outcome |
+| --- | --- | --- | --- | --- | --- | --- |
+| `#` | `<title>` | `<sha>` | `<method>` | `<pass/evidence>` | `<issues>` | `<merged/closed/commented>` |
+
+## Stopped Before
+
+| PR | Reason | Required Follow-Up |
+| --- | --- | --- |
+| `#` | `<reason>` | `<follow-up>` |
+
+## Issue Reconciliation
+
+| Issue | Expected Outcome | Actual Outcome | Action Taken |
+| --- | --- | --- | --- |
+| `#` | `<auto-close/comment/remain open>` | `<actual>` | `<action>` |
+
+## Next Recommended Candidate
+
+- PR: `#<number>`
+- Reason: `<why next>`
+- Required check before merge: `<check>`
+
+## Session Notes
+
+- `<note>`