Consolidate all muse-related functionality from think/utils.py into a new think/muse.py module for better organization and maintainability: - Move prompt loading (load_prompt, PromptContent, PromptNotFoundError) - Move config discovery (get_muse_configs, get_agent, _load_prompt_metadata) - Move instruction composition (compose_instructions, _merge_instructions_config) - Move source helpers (source_is_enabled, source_is_required, get_agent_filter) - Move output path utilities (key_to_context, get_output_topic, get_output_path) - Move hook loading (load_pre_hook, load_post_hook, _resolve_hook_path) Update all consumers to import from think.muse instead of think.utils. Create tests/test_muse.py with dedicated tests for the new module. Update documentation references from think/utils.py to think/muse.py. No legacy re-exports or backwards compatibility - all usages updated directly. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>