fix: repair Renovate config, convert Makefile to go run, update GitHub Actions (#120)

* fix: repair Renovate config and convert Makefile to go run (#117)

- Remove non-existent `github>renovatebot/presets:golang` preset that
  broke Renovate PR creation
- Replace deprecated `fileMatch` with `managerFilePatterns` in
  customManagers
- Rewrite regex to match new Makefile pattern (renovate comment above
  version variable assignment)
- Fix `matchFileNames` glob pattern (`*.mk` -> `**/*.mk`)
- Convert all tool invocations from `go install` + global binary to
  `go run tool@version` for reproducible builds
- Convert npm global tools to `npx --yes` invocations
- Remove `dev-deps` and `check-deps` targets (tools auto-download)
- Add mdformat pre-commit hook with GFM support and config
- Add `fmt-md` Makefile target for manual markdown formatting
- Update local golangci-lint pre-commit hook to use `go run`
- Apply golangci-lint v2.10.1 auto-fixes (fmt.Fprintf optimization)
- Add nolint:gosec annotations for legitimate exec.Command usage
- Exclude .serena/ from mdformat and megalinter
- Add markdown indent_size=unset in .editorconfig for CommonMark compat

* chore(deps): update GitHub Actions to latest versions

- anthropics/claude-code-action: v1.0.34 -> v1.0.64
- actions/setup-go: v6.2.0 -> v6.3.0
- actions/upload-artifact: v6.0.0 -> v7.0.0
- goreleaser/goreleaser-action: v6.4.0 -> v7.0.0
- docker/login-action: v3.6.0 -> v3.7.0
- ivuorinen/actions: v2026.01.21 -> v2026.02.24

* fix: address code review feedback

- Fix issue template YAML frontmatter (replace underscore separators
  with proper --- delimiters); exclude templates from mdformat
- Replace string(rune(n)) with strconv.Itoa(n) in test files to produce
  deterministic numeric directory names instead of Unicode characters
- Remove stale `make dev-deps` reference in README, replace with
  `make dev-setup`
- Extract ban/unban format strings into shared.MetricsFmtBanOperations
  and shared.MetricsFmtUnbanOperations constants
- Replace hardcoded coverage percentages in README with evergreen
  phrasing

* fix: address round 2 code review feedback for PR #120

- Fix corrupted path traversal example in docs/security.md
- Fix Renovate .mk regex to match nested paths (.*\.mk$)
- Update checkmake pre-commit hook to v0.3.2 to match Makefile
- Add sync.WaitGroup to unsynchronized goroutines in security tests
- Fix fmt-md target to use pre-commit run mdformat
- Pin markdownlint-cli2 to v0.21.0 in lint-md target
- Standardize //nolint:gosec to // #nosec annotations for gosec CLI

* fix(ci): install PyYAML dependency for PR lint workflow

The pr-lint workflow uses ivuorinen/actions/pr-lint which internally
calls validate-inputs running a Python script that imports yaml.
Python was set up but PyYAML was never installed, causing
ModuleNotFoundError at runtime.

* fix: address round 3 code review feedback for PR #120

- Wrap Windows-style path traversal example in backtick code span so
  backslashes render literally in docs/security.md
- Add Renovate-managed MARKDOWNLINT_CLI2_VERSION variable in Makefile
  to match the pattern used by all other tool versions

docs/faq.md

@@ -8,7 +8,7 @@
 extensible, and user-friendly alternative to Bash scripts for interacting with Fail2Ban, with automatic sudo
 privilege management, shell completion, and comprehensive security features.
 
----
+______________________________________________________________________
 
 ## Installation & Setup
 
@@ -34,7 +34,7 @@ Or install globally:
 go install github.com/ivuorinen/f2b@latest
 ```
 
----
+______________________________________________________________________
 
 ## Usage
 
@@ -171,7 +171,7 @@ f2b --command-timeout=45s ban 192.168.1.100
 f2b --parallel-timeout=120s banned all
 ```
 
----
+______________________________________________________________________
 
 ## Troubleshooting
 
@@ -193,9 +193,9 @@ f2b --parallel-timeout=120s banned all
 This means you need elevated privileges for the operation you're trying to perform:
 
 1. **Check your privileges:** Run `f2b --log-level=debug version` to see your privilege status
-2. **Add sudo:** Try `sudo f2b [command]`
-3. **Join sudo group:** Ask your admin to add you to the sudo group
-4. **Test sudo access:** Run `sudo -n true` to check if you can use sudo
+1. **Add sudo:** Try `sudo f2b [command]`
+1. **Join sudo group:** Ask your admin to add you to the sudo group
+1. **Test sudo access:** Run `sudo -n true` to check if you can use sudo
 
 ### The CLI says "permission denied" or "operation not permitted"
 
@@ -265,7 +265,7 @@ ls -la /etc/fail2ban/
 sudo fail2ban-client ping
 ```
 
----
+______________________________________________________________________
 
 ## Development
 
@@ -279,11 +279,11 @@ go test ./...
 
 See the `CONTRIBUTING.md` and the Contributing section in the README.
 
----
+______________________________________________________________________
 
 ## Still need help?
 
 - Open an issue on GitHub: https://github.com/ivuorinen/f2b/issues
 - Contact the maintainer: ismo@ivuorinen.net
 
----
+______________________________________________________________________