Inspect authoritative Git remote state

docs/internal/overview.md

@@ -17,6 +17,8 @@ Implemented internal packages:
 - `internal/candidate` captures and validates one clean local candidate, checks
   its committed release note and local tag state, runs validation once, and
   rechecks mutable repository state.
+- `internal/git` resolves one effective push destination, applies it to a
+  command-scoped remote, and reads exact authoritative branch and tag refs.
 - `cmd/releasekit/internal/cli` parses implemented commands, loads strict JSON
   profiles, and adapts configured checks to the process runner.