fix(athena): implement 10 prompt audit fixes from council review

- Fix 1: Clarify 'restart at Step 3' → 'restart the council workflow from Step 3 (intent classification)'
- Fix 2: Replace {council-session-name} with static references to council_finalize archive_dir
- Fix 3: Add documenting comment for call_omo_agent in solo mode allowlist
- Fix 4: Add delegation agent rationale comment to RUNTIME_GUIDANCE_BY_INTENT
- Fix 5: Type-safe COUNCIL_INTENT_ADDENDUMS with Record<CouncilIntent, string>
- Fix 6: Clarify FREEFORM wording re COUNCIL_MEMBER_RESPONSE tag requirement
- Fix 7: Remove dead Step 15 fallback from agent.ts
- Fix 8: Add compound question intent precedence guidance
- Fix 9: Fix AUDIT double-period typo
- Fix 10: Add edge case test for extractCouncilResponse with literal tag text

src/agents/athena/council-member-agent.ts

@@ -86,6 +86,10 @@ export function createCouncilMemberAgent(model: string): AgentConfig {
     "lsp_symbols",
     "lsp_diagnostics",
     "ast_grep_search",
+    // call_omo_agent is included in both solo and delegation modes.
+    // Solo mode restricts its use via prompt instruction (COUNCIL_SOLO_ADDENDUM)
+    // rather than tool-level restriction. This is intentional — tool-level
+    // restriction would require separate agent configs per mode.
     "call_omo_agent",
     "background_output",
     "background_wait",