feat(council): add executable roster and tier planner

skills/council/scripts/council.sh

@@ -160,6 +160,12 @@
 # Single-round labels may still look like council-pragmatist / council-meta for readability,
 # but the runtime target should be the dedicated council agent id.
 #
+# Canonical executable source of truth:
+#   references/roster.json
+#   scripts/council-plan.py
+#
+# Resolve mode+tier there first, then spawn using the returned agent ids/model overrides.
+#
 # ─── WORD COUNT GUIDANCE ──────────────────────────────────────────
 #
 # Personality mode: