feat: add per-role model selection via .env (OWNER/REVIEWER/ARBITER_MODEL, _EFFORT, _FALLBACK_ENABLED)

.env.example

@@ -42,6 +42,21 @@ STATUS_CHANNEL_ID=                    # Discord channel ID for live status updat
 # FALLBACK_SMALL_MODEL=kimi-k2.5      # Fallback small model
 # FALLBACK_COOLDOWN_MS=600000         # Cooldown between fallback attempts (10min)
 
+# --- Per-role model overrides (paired rooms) ---
+# Override global CLAUDE_MODEL/CODEX_MODEL per role.
+# Model is injected based on each role's agent type (claude-code → CLAUDE_MODEL, codex → CODEX_MODEL).
+# OWNER_MODEL=gpt-5.4                   # Owner model override
+# OWNER_EFFORT=xhigh                    # Owner effort override
+# OWNER_FALLBACK_ENABLED=true           # Fall back to codex on Claude failure (default: true)
+#
+# REVIEWER_MODEL=claude-opus-4-6        # Reviewer model override
+# REVIEWER_EFFORT=high                  # Reviewer effort override
+# REVIEWER_FALLBACK_ENABLED=true        # Fall back to codex on Claude failure (default: true)
+#
+# ARBITER_MODEL=claude-sonnet-4-6       # Arbiter model override
+# ARBITER_EFFORT=high                   # Arbiter effort override
+# ARBITER_FALLBACK_ENABLED=true         # Fall back to codex on Claude failure (default: true)
+
 # --- Advanced ---
 # MAX_CONCURRENT_AGENTS=5             # Max parallel agent processes
 # SESSION_COMMAND_ALLOWED_SENDERS=    # Comma-separated Discord user IDs for session commands