agents: review round 2 — split-PR flow, thread recency, mention boundaries, learnings cap, pm model

- publish.sh: resolve_prs matches ai/issue-N AND ai/issue-N-<slug> split branches
  (exact-only silently stalled DELEGATE:@qa and autopilot MERGE_PR on slugged
  work); qa hand-off lists all open PRs; autopilot refuses to merge multi-PR
  issues (drops the label, hands to the human) — merging one of several open
  PRs is half a change deployed. Retro's state=all resolve matches slugs too.
- fetch-thread.sh: paginate and keep the NEWEST 100 comments — a bare limit=100
  kept the OLDEST page and dropped recent decisions on long threads.
- route.sh: word-boundary mention matching ("@internal" no longer routes to
  @intern); a comment with no real agent mention now SKIPS gracefully
  (mode=skip outputs + step guards in agent.yml) instead of a red run.
- run-agent.sh: LEARNINGS.md cap is line-aware and keeps the NEWEST entries
  (retros append at the bottom; the old head -c cut the latest lessons first).
- agents.json/README: @pm gemma4 -> minimax-m3 — the retro rule demands an
  investigating PM, and gemma4 posted 0 tool calls on every run; minimax is the
  model @qa demonstrably uses tools with.
- agent.yml: document the PR-thread concurrency-group caveat.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.gitea/workflows/scripts/fetch-thread.sh

@@ -4,14 +4,25 @@
 # to its real author (@pm/@qa/@junior/…). Strip the hidden `<!-- 🤖 … -->` loop-prevention marker
 # from bodies — it's plumbing, not conversation, and would just waste prompt tokens.
 #
+# PAGINATION: Gitea returns comments ASCENDING and `limit` caps a single page — a bare ?limit=100
+# used to keep the OLDEST 100 comments and silently drop the newest (the exact opposite of what an
+# agent needs on a long thread). Fetch all pages (up to 10 = 500 comments) and keep the LAST 100.
+#
 # Required env (provided by the workflow step): GT NUM GITHUB_SERVER_URL GITHUB_REPOSITORY
 set -eu
 
 API="${GITHUB_SERVER_URL}/api/v1/repos/${GITHUB_REPOSITORY}"
-curl -sS -H "Authorization: token $GT" "$API/issues/$NUM/comments?limit=100" 2>/dev/null \
-  | jq -r '.[] |
-      ( if (.user.login == "ffaerber") then "@ffaerber (the maintainer)"
-        else "@" + .user.login end ) as $who |
-      "### comment by \($who):\n\(.body | gsub("\\s*<!-- 🤖 agent reply — do not trigger -->"; ""))\n"' \
-  > /tmp/thread.md 2>/dev/null || true
-echo "thread comments fetched: $(grep -c '^### comment by ' /tmp/thread.md 2>/dev/null || echo 0)"
+: > /tmp/thread_pages.json
+for page in $(seq 1 10); do
+  pg=$(curl -sS -H "Authorization: token $GT" "$API/issues/$NUM/comments?limit=50&page=$page" 2>/dev/null) || pg='[]'
+  n=$(printf '%s' "$pg" | jq 'if type=="array" then length else 0 end' 2>/dev/null || echo 0)
+  [ "${n:-0}" -gt 0 ] && printf '%s\n' "$pg" >> /tmp/thread_pages.json
+  [ "${n:-0}" -lt 50 ] && break
+done
+jq -rs '
+  add // [] | .[-100:] | .[] |
+  ( if (.user.login == "ffaerber") then "@ffaerber (the maintainer)"
+    else "@" + .user.login end ) as $who |
+  "### comment by \($who):\n\(.body | gsub("\\s*<!-- 🤖 agent reply — do not trigger -->"; ""))\n"' \
+  /tmp/thread_pages.json > /tmp/thread.md 2>/dev/null || : > /tmp/thread.md
+echo "thread comments fetched: $(grep -c '^### comment by ' /tmp/thread.md 2>/dev/null || echo 0) (newest 100 kept)"