fix: add missing Makefile targets (docker, hooks) and test timeout (#159)

## Changes

- Add `docker` target (`docker build .`)
- Add `hooks` target (installs pre-commit hook running `make check`)
- Add 30-second timeout to `test` target (`-timeout 30s`)
- Update `.PHONY` to include new targets
- Update README to document all Makefile targets (`fmt-check`, `docker`, `hooks`)
- Run `make fmt` to fix JS formatting via prettier

`docker build .` passes ✅

closes #136, closes #137

<!-- session: agent:sdlc-manager:subagent:44375174-444b-43bf-a341-2def7ebb9fdf -->

Co-authored-by: clawbot <clawbot@noreply.git.eeqj.de>
Co-authored-by: Jeffrey Paul <sneak@noreply.example.org>
Reviewed-on: #159
Co-authored-by: clawbot <clawbot@noreply.example.org>
Co-committed-by: clawbot <clawbot@noreply.example.org>

README.md

@@ -110,11 +110,14 @@ chi Router ──► Middleware Stack ──► Handler
 ### Commands
 
 ```bash
-make fmt      # Format code
-make lint     # Run comprehensive linting
-make test     # Run tests with race detection
-make check    # Verify everything passes (lint, test, build, format)
-make build    # Build binary
+make fmt       # Format code
+make fmt-check # Check formatting (read-only, fails if unformatted)
+make lint      # Run comprehensive linting
+make test      # Run tests with race detection (30s timeout)
+make check     # Verify everything passes (fmt-check, lint, test)
+make build     # Build binary
+make docker    # Build Docker image
+make hooks     # Install pre-commit hook (runs make check)
 ```
 
 ### Commit Requirements