agents: fix review findings — thread attribution, races, rescue stall, docs, CI

Fixes from a full repo review:

- fetch-thread.sh: attribute every comment to its REAL author (@pm/@qa/… —
  agents post as their own users now); the old "🤖 @name line at the top" hint
  pointed at headers we removed, leaving every teammate comment anonymous. Also
  strip the hidden loop-prevention marker from bodies (prompt noise).
- agent.yml: per-issue concurrency group (queued, no cancel) — two quick
  comments on one issue no longer race the same ai/issue-N branch.
- rescue-pr.sh: after opening a rescue PR, hand it back into the flow with an
  unmarked @pm trigger (the pm→qa choreography previously stalled silently on
  any rescued run); drop the old "🤖 **@name**" header style; add ops to the
  token case; mark the status note with the hidden marker.
- README: token table said "@qa merges / TOKEN_QA needs write:repository" —
  inverted since the PM-orchestrated flow (@pm merges, autopilot only; @qa is
  read-only). Updated the agent table (descs, node1-ssh moved to homelab) and
  added a "How a task flows" section.
- agents.json: pm/qa descs now describe the orchestrator/reviewer roles (these
  feed the roster prompt agents route by).
- NEW ci.yml: bash -n + shellcheck(-S error) on every script, YAML-parse on
  every workflow, agents.json schema check — the ${x:-{}} brace bug would have
  been caught here before it shipped.
- install-opencode.sh: pin opencode (default 1.17.13, override via
  OPENCODE_VERSION) — a breaking release no longer takes down every agent.
- build-activity-log.sh: ollama/ollama-cloud models are subscription-billed
  (no $/token exists) — label the footer "subscription" instead of a
  misleading $0.0000; metered (anthropic) models keep the real dollar cost.
- route.sh: document that mention-priority is list-order and load-bearing for
  the flow's trigger comments.

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

.gitea/workflows/scripts/build-activity-log.sh

@@ -36,14 +36,20 @@ read -r COST INP OUT CR CW RE < <(jq -rs '
   | @tsv' "$E" 2>/dev/null)
 COST=${COST:-0}; INP=${INP:-0}; OUT=${OUT:-0}; CR=${CR:-0}; CW=${CW:-0}; RE=${RE:-0}
 IN_TOTAL=$(( INP + CR + CW ))                          # total input context processed
-COSTF=$(awk -v c="$COST" 'BEGIN{printf "$%.4f", c+0}')
+# Cost label: ollama / ollama-cloud models are SUBSCRIPTION-billed (GPU-time against the plan, no
+# $/token price exists), so a "$0.0000" there would be misleading — label it a subscription instead.
+# Metered providers (anthropic/…) get the real dollar cost opencode computed.
+case "${MODEL:-}" in
+  ollama*|*"/ollama"*) COSTF="subscription" ;;
+  *) COSTF=$(awk -v c="$COST" 'BEGIN{printf "$%.4f", c+0}') ;;
+esac
 echo "usage: in=$IN_TOTAL out=$OUT cost=$COSTF (fresh=$INP cache_r=$CR cache_w=$CW reasoning=$RE); tools=$n"
 
 {
   if [ "$n" -gt 0 ]; then
     printf '\n\n<details>\n<summary>🔧 %s tool calls · in %s · out %s · %s</summary>\n\n' "$n" "$IN_TOTAL" "$OUT" "$COSTF"
     cat /tmp/tools.md
-    printf '\n\n<sub>tokens — input %s (fresh %s · cache %sw / %sr) · output %s · reasoning %s · **cost %s**</sub>\n</details>' \
+    printf '\n\n<sub>tokens — input %s (fresh %s · cache %sw / %sr) · output %s · reasoning %s · **%s**</sub>\n</details>' \
       "$IN_TOTAL" "$INP" "$CW" "$CR" "$OUT" "$RE" "$COSTF"
   else
     printf '\n\n<sub>💰 **%s** · in %s · out %s tokens (cache %sw / %sr)</sub>' "$COSTF" "$IN_TOTAL" "$OUT" "$CW" "$CR"