feat: tool schema optimization, keyword routing, aider_run coding agent

Tool schema optimization (PLAN__Tool_Schema_Optimization.md Phases 1-3):
- model_registry.py: ROLE_DEFAULT_TOOLS — distill gets [], research/coder get
  narrow tool lists by default; applied in get_role_config() when user hasn't
  configured a custom list
- openai_orchestrator.py: keyword routing via narrow_tools_by_keywords() — scans
  user message + last assistant turn; narrows active schemas to matched categories
  only (e.g. "weather" → 3 web tools instead of 69); zero tools sent for pure chat
- openai_orchestrator.py: _get_cached_tools() — module-level schema cache keyed by
  (role, sorted_tool_list, risk_params); eliminates redundant schema rebuilds
- openai_orchestrator.py: _TOOL_SCHEMA_OVERHEAD 3000 → 500 tokens (schemas now
  excluded from the per-call fixed estimate since they're cached separately)
- tools/__init__.py: CATEGORY_TOOL_MAP + _KEYWORD_CATEGORY_MAP + classify_tool_categories()
  + narrow_tools_by_keywords() — the classifier logic lives here so both orchestrators
  can share it

aider_run tool (cortex/tools/aider.py):
- Invokes Aider as a subprocess with --message --yes-always --no-pretty --no-stream
- Project aliases: cortex / aether_api / aether_frontend / aether_container
- Auto-injects OpenRouter API key from Cortex model registry (no ~/.env needed)
- background=True fires async + registers in agent_manager; notify=True sends push
  notification on completion
- admin-only, confirm-required, TOOL_RISK=high
- .gitignore: added .aider.chat.history.md / .aider.input.history / .aider.llm.history

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

@@ -25,5 +25,11 @@ tmp/
 *.tmp
 *.log
 
+# Aider — history files are personal/ephemeral; .aider.conf.yml is project config and IS tracked
+.aider.chat.history.md
+.aider.input.history
+.aider.llm.history
+
 # System files
 .DS_Store
+.aider*