refactor(athena): remove type assertions and improve agent factories

- Replace 'as AgentConfig' casts with proper typing in agent.ts and council-member-agent.ts
- Extract permission into typed variable following Sisyphus pattern
- Add GPT/non-GPT model branching to council-member-agent
- Use parseModelString for schema validation instead of inline logic
- Add strict() to council and athena config schemas
- Fix athena restriction list (remove redundant athena_council deny)
- Add orchestrator logging for council execution
- Update system prompt to notification-based workflow

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/shared/agent-tool-restrictions.ts

@@ -16,7 +16,7 @@ const EXPLORATION_AGENT_DENYLIST: Record<string, boolean> = {
 }
 
 const ATHENA_RESTRICTIONS = permissionToToolBooleans(
-  createAgentToolRestrictions(["write", "edit", "athena_council"]).permission
+  createAgentToolRestrictions(["write", "edit"]).permission
 )
 
 const AGENT_RESTRICTIONS: Record<string, Record<string, boolean>> = {