fix: add mission detection to session hooks

Patches session-start.sh to detect active orchestrator missions
and print a banner with phase, milestone, progress, and scratchpad.
Patches session-end.sh to record session results in mission.json.

These were in the mosaic-bootstrap template but not yet applied
to this project's existing hooks.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/agent/session-end.sh

@@ -8,6 +8,33 @@ source "$SCRIPT_DIR/common.sh"
 ensure_repo_root
 load_repo_hooks
 
+# ─── Mission session cleanup (ORCHESTRATOR-PROTOCOL) ────────────────────────
+ORCH_DIR=".mosaic/orchestrator"
+MISSION_JSON="$ORCH_DIR/mission.json"
+SESSION_LOCK="$ORCH_DIR/session.lock"
+COORD_LIB="$HOME/.config/mosaic/tools/orchestrator/_lib.sh"
+
+if [[ -f "$SESSION_LOCK" ]] && [[ -f "$COORD_LIB" ]] && command -v jq &>/dev/null; then
+  # shellcheck source=/dev/null
+  source "$COORD_LIB"
+
+  sess_id="$(jq -r '.session_id // ""' "$SESSION_LOCK")"
+  if [[ -n "$sess_id" && -f "$MISSION_JSON" ]]; then
+    updated="$(jq \
+      --arg sid "$sess_id" \
+      --arg ts "$(iso_now)" \
+      --arg reason "completed" \
+      '(.sessions[] | select(.session_id == $sid)) |= . + {
+        ended_at: $ts,
+        ended_reason: $reason
+      }' "$MISSION_JSON")"
+    echo "$updated" > "$MISSION_JSON.tmp" && mv "$MISSION_JSON.tmp" "$MISSION_JSON"
+    echo "[agent-framework] Session $sess_id recorded in mission state"
+  fi
+
+  session_lock_clear "."
+fi
+
 if declare -F mosaic_hook_session_end >/dev/null 2>&1; then
   run_step "Run repo end hook" mosaic_hook_session_end
 else