feat(config): add councils schema and defaults

config/default.yaml

@@ -590,6 +590,47 @@ automation:
 #       Be concise and match the operator's tone. Skip marketing emails.
 #       Never send messages without explicit instruction — draft only.
 
+# ── Councils Pipeline ────────────────────────────────────────────────
+# Deterministic dual-council orchestration (D/P groups) with bridge-only
+# exchange and a deterministic meta merge. Requires matching agent_configs
+# for the configured role names below.
+#
+# councils:
+#   enabled: false
+#   defaults:
+#     max_rounds: 2
+#     ideas_per_round: 6
+#     top_ideas_for_bridge: 3
+#     bridge_packet_max_chars: 2500
+#     bridge_field_max_bullets: 6
+#     bridge_entry_max_chars: 300
+#     novelty_delta_threshold: 10
+#     repetition_threshold: 70
+#   strict_grounding: false
+#   strict_meta_validation: true
+#   groups:
+#     D:
+#       arbiter_agent: council_d_arbiter
+#       freethinker_agent: council_d_freethinker
+#       group_prompt_prefix: Optimize for feasibility and speed-to-test. Prefer boring-but-true.
+#       novelty_bias: low
+#       risk_tolerance: low
+#       forbidden_approaches:
+#         - moonshots
+#         - handwavy AI claims
+#         - unverified assumptions
+#     P:
+#       arbiter_agent: council_p_arbiter
+#       freethinker_agent: council_p_freethinker
+#       group_prompt_prefix: Optimize for reframing and non-obvious leverage. Weird is fine; label speculation.
+#       novelty_bias: high
+#       risk_tolerance: high
+#       forbidden_approaches:
+#         - incremental tweaks
+#         - obvious best practices
+#         - purely conventional solutions
+#   meta_arbiter_agent: council_meta_arbiter
+
 # Optional: explicit intent rules for agent routing.
 # If enabled, these rules are evaluated before default sender/channel routing.
 # The research agent can already be auto-routed by prefix (`research ...`, `look up ...`)