docs(athena): comprehensive council documentation covering all configs and behaviors

Added missing documentation for:
- Council resilience settings (retry_on_fail, stuck_threshold, member_max_running)
- bulk_launch config for launch strategy
- Council tools (prepare_council_prompt, athena_council, council_finalize)
- Council archives (.sisyphus/athena/)
- Force-background and TTL exemption for athena-junior
- Council-member agent overrides and tool allowlist
- How to invoke athena-junior (task() and CLI)
- Updated agent list to include athena and council-member
- Added Athena subsections to table of contents
- Auto-generated schema.json update for bulk_launch field

assets/oh-my-opencode.schema.json

@@ -5274,6 +5274,10 @@
               ],
               "additionalProperties": false
             },
+            "bulk_launch": {
+              "default": false,
+              "type": "boolean"
+            },
             "non_interactive_mode": {
               "default": "delegation",
               "type": "string",