Consolidate hooks: merge bin/hooks and hooks into single hooks/ directory

- Removed bin/hooks/ wrapper layer
- Moved all hook logic into consolidated hooks/*-hook.ts files
- Each hook now handles its own stdin/stdout/JSON wrapping
- Removed ALL try-catch blocks from context-hook (let errors surface)
- Updated build script to reference new src/hooks/ paths
- Reduced from 12+ files to 6 hook files

This simplifies the architecture and makes debugging actually possible.

scripts/build-hooks.js

@@ -13,11 +13,11 @@ import { fileURLToPath } from 'url';
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 
 const HOOKS = [
-  { name: 'context-hook', source: 'src/bin/hooks/context-hook.ts' },
-  { name: 'new-hook', source: 'src/bin/hooks/new-hook.ts' },
-  { name: 'save-hook', source: 'src/bin/hooks/save-hook.ts' },
-  { name: 'summary-hook', source: 'src/bin/hooks/summary-hook.ts' },
-  { name: 'cleanup-hook', source: 'src/bin/hooks/cleanup-hook.ts' }
+  { name: 'context-hook', source: 'src/hooks/context-hook.ts' },
+  { name: 'new-hook', source: 'src/hooks/new-hook.ts' },
+  { name: 'save-hook', source: 'src/hooks/save-hook.ts' },
+  { name: 'summary-hook', source: 'src/hooks/summary-hook.ts' },
+  { name: 'cleanup-hook', source: 'src/hooks/cleanup-hook.ts' }
 ];
 
 const WORKER_SERVICE = {