1. Shared tool definitions (DRY):
   - Create tools-core/src/tool-defs.ts with canonical TOOL_DEFS
   - action/client.ts builds Anthropic tools from shared defs
   - tools/register.ts builds zod schemas from shared defs
   - Eliminates duplicated tool names, descriptions, and parameters

2. Client test cases (error handling, timeouts, iteration limits):
   - Tool execution error sends is_error back to Claude
   - Parallel tool_use blocks execute via Promise.all
   - Wall-clock timeout returns partial text or throws
   - Max iterations (30) returns partial text or throws

3. Risk score parsing edge cases:
   - Boundary values 0/100 and 100/100
   - Unparseable report skips threshold check
   - Score equal to threshold triggers failure (>= comparison)
   - Non-Error rejection handled in main()

Create C3v4 architecture docs covering all 4 containers, 16 components,
and 3 cross-cutting refs. Documents the system context, container
boundaries, component responsibilities, and shared patterns (git
operations, ESM conventions, build pipeline).

Doc fixes:
- Add tool-defs.ts to source layouts in CLAUDE.md and README.md
- Fix comment marker text in action/CLAUDE.md
- Add c3-generated blocks to all package CLAUDE.md files
- Update test count to 100

Code fixes:
- find-imports: strip /index suffix in normalizeModulePath so bare
  directory imports match index files
- client: throw on empty output instead of returning empty string
- comment: log warning on API failure instead of silent null return

Test additions:
- find-imports: dynamic import(), require(), directory-to-index
  resolution, unreadable file handling
- list-files: copied (C) status, binary files