feat(releaseprep): migrate standalone tool into vociferate

README.md

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+# vociferate
+
+A reusable release preparation tool for Go repositories.
+
+## Build
+
+Build with just:
+
+```bash
+just go-build
+```
+
+Or directly with Go:
+
+```bash
+go build -o dist/releaseprep ./cmd/releaseprep
+```
+
+## Usage
+
+Prepare release files:
+
+```bash
+go run ./cmd/releaseprep --version v1.2.3 --date 2026-03-20 --root .
+```
+
+Recommend next release tag from changelog content:
+
+```bash
+go run ./cmd/releaseprep --recommend --root .
+```
+
+### Flags
+
+- `--version` semantic version to release (with or without leading `v`).
+- `--date` release date in `YYYY-MM-DD` format.
+- `--recommend` print recommended next tag based on `## [Unreleased]`.
+- `--root` repository root directory.
+- `--version-file` path to version source file relative to `--root`.
+- `--version-pattern` regexp with exactly one capture group for version value.
+- `--changelog` path to changelog file relative to `--root`.
+
+Defaults:
+
+- `version-file`: `internal/releaseprep/version/version.go`
+- `version-pattern`: `const String = "([^"]+)"`
+- `changelog`: `changelog.md`
+
+## Testing
+
+```bash
+just go-test
+```