refactor: split tool declarations into domain files + role config UI
tools/__init__.py shrinks from 1,137 → 250 lines. Each domain file now owns both its callables and its FunctionDeclarations (DECLARATIONS list), so adding a new tool only touches one file. New TOOL_CATEGORIES dict exported from __init__ — used by the UI for grouped tool checkboxes. Role config UI (Settings → Model Registry → Role Assignments): - ⚙ button per role expands an inline configure panel - Textarea for system_append (injected into system prompt for this role) - Grouped checkboxes for tool allow-list (all checked = no restriction) - POST /api/models/role-config saves both fields; updates ROLE_CONFIG_DATA in-page so re-open reflects current state without a page reload Backend: - model_registry.set_role_config() writes system_append + tools to registry - TOOL_CATEGORIES exported from tools/__init__ for UI rendering - TOOLS.md header updated: 30 → 39 tools (ae_journal_* and cortex_* additions) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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