v0.15.0

Minor Changes

• 4e5dc9f: Add the repo.changed push contract at @ikenga/contract/app-bridge
  (REPO_CHANGED_METHOD, RepoChangedParams + RepoChangedParamsSchema,
  RepoChangedEnvelope + RepoChangedEnvelopeSchema, readRepoChangedParams,
  isRepoChangedNotification, HOST_NOTIFICATION_MAX_PER_SEC).

  This types the notification a pkg's long-lived MCP server emits via
  server.sendLoggingMessage so its iframe learns a git repo moved on disk
  without polling. The shell's existing relay carries it: the Rust supervisor
  matches notifications/message, rate-caps per pkg, and emits the
  pkg-mcp-notification Tauri event (shell/src-tauri/src/pkg/lifecycle.rs),
  which pkg-iframe-host.tsx Step 3b forwards verbatim onto the iframe's
  AppBridge wire. No new shell plumbing.

  Note there is no sidecar push path: manifest.sidecars[] entries are not
  supervised and host.pkgSidecarCall spawns a fresh one-shot process per call.
  The rate cap is a tumbling one-second window, so a burst straddling two
  windows can deliver up to 2x the cap in one arbitrary second.

  New file, additive only.