chore: release v0.5.0 (#22)

Ships the [tag] mode = full|bump-only feature (#17, PR #19). Version
bump only; release.yml creates the v0.5.0 tag on merge and builds +
publishes.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: tizz98

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "ai-meta"
-version = "0.4.0"
+version = "0.5.0"
 edition = "2021"
 rust-version = "1.80"
 description = "The LLM's missing meta framework — one versioned CLI that scaffolds, lints, and syncs project tooling across repos."