v0.1.8 Improve text formatting, update docs

🐛 Bug Fixes
- Fixes body text rewrapping issue where incorrectly wrapped input was
  worsened. Now, lines are buffered, unwrapped, then correctly rewrapped
  as paragraphs, preserving list formatting.
- Removes HTML escaping from commit bodies. HTML sanitization was
  unnecessary and harmful, escaping literal characters such as < and >
  in plain text commit messages.

📚 Documentation
- Adds CHANGELOG.md, tracking releases following Keep a Changelog.
  Updates README to include a Changelog section pointing to the new file
  and noting maintenance by kittylog.
- Replaces usage section with related tools information.
- (installation): Streamlines setup instructions.
- (installation): Adds binary installation method.

♻️ Code Refactoring
- (release): Simplifies version bumping logic by consolidating
  prerelease logic into a case statement. Adds a 'graduate' option for
  prerelease versions and uses svu's built-in prerelease flag with a
	user-provided suffix. When graduating, llm-tag now generates a
  changelog from the last stable tag.

🔧 Build System
- Migrates from just to task. Replaced justfile with Taskfile.yaml
  adapted from the nasin-pali project. Updates AGENTS.md to reference
  task commands instead of just commands.
- (crush): Adds to gopls settings.
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