agent-session-kit 0.8.0

The Rust lane can now delete a whole session, fenced exactly as the Swift
SessionDeleter — the piece a second client needs before it may offer
deletion at all.

Added

• Rust: deletion module. agent-session-core can now remove a whole
  session's own log files — the Rust counterpart of the Swift
  SessionDeleter, fenced the same way: every target must resolve strictly
  below one of the provider's roots under the given home, a target that is
  itself a symlink is refused, the session file is re-parsed immediately
  before removal so a stale summary cannot delete a different session, and
  only Codex and Claude sessions (supports_deletion) are ever candidates.
  Claude removes the sidecar directory of the same stem when it exists; a
  directory is walked without following links. Hosts call it only at the
  person's explicit request.