feat: Add impact analysis for component dependency tracking

- New tables: components, component_dependencies, component_files,
  verification_checks, change_impacts, impact_analysis_runs
- 8 new MCP tools: component_register, component_list,
  component_add_dependency, component_add_file, component_add_check,
  impact_analysis, impact_learn, component_graph
- Seed data: 17 components, 9 dependencies, 12 file patterns, 5 checks
- Historical impacts from session 397 issues recorded

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

migrations/009_impact_analysis.sql

@@ -0,0 +1,78 @@
+-- Impact Analysis Schema
+-- Tracks system components, dependencies, and verification checks
+
+-- Components registry
+CREATE TABLE IF NOT EXISTS components (
+    id TEXT PRIMARY KEY,
+    name TEXT NOT NULL,
+    type TEXT NOT NULL CHECK (type IN ('service', 'script', 'config', 'database', 'api', 'ui', 'library')),
+    path TEXT,
+    repo TEXT,
+    description TEXT,
+    health_check TEXT,
+    created_at TIMESTAMP DEFAULT NOW(),
+    updated_at TIMESTAMP DEFAULT NOW()
+);
+
+-- Component dependencies (directed graph)
+CREATE TABLE IF NOT EXISTS component_dependencies (
+    id SERIAL PRIMARY KEY,
+    component_id TEXT NOT NULL REFERENCES components(id) ON DELETE CASCADE,
+    depends_on TEXT NOT NULL REFERENCES components(id) ON DELETE CASCADE,
+    dependency_type TEXT NOT NULL CHECK (dependency_type IN ('hard', 'soft', 'config', 'data')),
+    description TEXT,
+    created_at TIMESTAMP DEFAULT NOW(),
+    UNIQUE(component_id, depends_on)
+);
+
+-- File-to-component mapping (for git diff analysis)
+CREATE TABLE IF NOT EXISTS component_files (
+    id SERIAL PRIMARY KEY,
+    component_id TEXT NOT NULL REFERENCES components(id) ON DELETE CASCADE,
+    file_pattern TEXT NOT NULL,
+    created_at TIMESTAMP DEFAULT NOW(),
+    UNIQUE(component_id, file_pattern)
+);
+
+-- Verification checks per component
+CREATE TABLE IF NOT EXISTS verification_checks (
+    id SERIAL PRIMARY KEY,
+    component_id TEXT NOT NULL REFERENCES components(id) ON DELETE CASCADE,
+    name TEXT NOT NULL,
+    check_type TEXT NOT NULL CHECK (check_type IN ('command', 'http', 'tcp', 'file')),
+    check_command TEXT NOT NULL,
+    expected_result TEXT,
+    timeout_seconds INTEGER DEFAULT 30,
+    created_at TIMESTAMP DEFAULT NOW()
+);
+
+-- Historical change impacts (learned from errors)
+CREATE TABLE IF NOT EXISTS change_impacts (
+    id SERIAL PRIMARY KEY,
+    changed_component TEXT NOT NULL REFERENCES components(id) ON DELETE CASCADE,
+    affected_component TEXT NOT NULL REFERENCES components(id) ON DELETE CASCADE,
+    impact_description TEXT NOT NULL,
+    error_id TEXT,
+    task_id TEXT,
+    learned_at TIMESTAMP DEFAULT NOW()
+);
+
+-- Impact analysis runs (audit log)
+CREATE TABLE IF NOT EXISTS impact_analysis_runs (
+    id SERIAL PRIMARY KEY,
+    task_id TEXT,
+    triggered_by TEXT NOT NULL CHECK (triggered_by IN ('task_close', 'manual', 'git_push')),
+    components_analyzed INTEGER DEFAULT 0,
+    issues_found INTEGER DEFAULT 0,
+    verification_passed BOOLEAN,
+    details JSONB,
+    created_at TIMESTAMP DEFAULT NOW()
+);
+
+-- Indexes for performance
+CREATE INDEX IF NOT EXISTS idx_component_deps_component ON component_dependencies(component_id);
+CREATE INDEX IF NOT EXISTS idx_component_deps_depends ON component_dependencies(depends_on);
+CREATE INDEX IF NOT EXISTS idx_component_files_component ON component_files(component_id);
+CREATE INDEX IF NOT EXISTS idx_change_impacts_changed ON change_impacts(changed_component);
+CREATE INDEX IF NOT EXISTS idx_change_impacts_affected ON change_impacts(affected_component);
+CREATE INDEX IF NOT EXISTS idx_impact_runs_task ON impact_analysis_runs(task_id);