REPO_POLICIES compliance audit (#40)

Brings the repository into compliance with REPO_POLICIES standards.

Closes [issue #39](#39).

## Changes

### Added files
- **REPO_POLICIES.md** — fetched from `sneak/prompts` (last_modified: 2026-02-22)
- **.editorconfig** — fetched from `sneak/prompts`, enforces 4-space indents (tabs for Makefile)
- **.dockerignore** — standard Go exclusions (.git/, bin/, *.md, LICENSE, .editorconfig, .gitignore)

### Makefile updates
- Added `fmt-check` target (read-only gofmt check)
- Added `hooks` target (installs pre-commit hook running `make check`)
- Added `docker` target (runs `docker build .`)
- Added `-timeout 30s` to both `test` and `check` targets
- Updated `.PHONY` list with all new targets

### Removed files
- **CLAUDE.md** — superseded by REPO_POLICIES.md
- **CONVENTIONS.md** — superseded by REPO_POLICIES.md

### README updates
- First line now includes project name, purpose, category (daemon), and author per REPO_POLICIES format
- Updated CONVENTIONS.md reference to REPO_POLICIES.md
- Added **License** section (pending author choice)
- Added **Author** section: [@sneak](https://sneak.berlin)

### Intentionally skipped
- **LICENSE file** — not created; license choice (MIT, GPL, or WTFPL) requires sneak's input

## Verification
- `docker build .` passes (all checks green: fmt, lint, tests, build)
- No changes to `.golangci.yml`, test assertions, or linter config

Co-authored-by: clawbot <clawbot@noreply.git.eeqj.de>
Co-authored-by: Jeffrey Paul <sneak@noreply.example.org>
Reviewed-on: #40
Co-authored-by: clawbot <clawbot@noreply.example.org>
Co-committed-by: clawbot <clawbot@noreply.example.org>

README.md

@@ -1,9 +1,10 @@
 # dnswatcher
 
+dnswatcher is a pre-1.0 Go daemon by [@sneak](https://sneak.berlin) that monitors DNS records, TCP port availability, and TLS certificates, delivering real-time change notifications via Slack, Mattermost, and ntfy webhooks.
+
 > ⚠️ Pre-1.0 software. APIs, configuration, and behavior may change without notice.
 
-dnswatcher is a production DNS and infrastructure monitoring daemon written in
-Go.  It watches configured DNS domains and hostnames for changes, monitors TCP
+dnswatcher watches configured DNS domains and hostnames for changes, monitors TCP
 port availability, tracks TLS certificate expiry, and delivers real-time
 notifications via Slack, Mattermost, and/or ntfy webhooks.
 
@@ -385,7 +386,18 @@ docker run -d \
 
 ## Project Structure
 
-Follows the conventions defined in `CONVENTIONS.md`, adapted from the
+Follows the conventions defined in `REPO_POLICIES.md`, adapted from the
 [upaas](https://git.eeqj.de/sneak/upaas) project template.  Uses uber/fx
 for dependency injection, go-chi for HTTP routing, slog for logging, and
 Viper for configuration.
+
+---
+
+## License
+
+License has not yet been chosen for this project. Pending decision by the
+author (MIT, GPL, or WTFPL).
+
+## Author
+
+[@sneak](https://sneak.berlin)