Merge pull request 'feat(bridge): protocol 4 — the permission mirror, and the first command that writes' (#4) from feat/phase-7-permissions into edge

Reviewed-on: #4

overlay.toml

@@ -26,8 +26,9 @@
 # the same change that alters the emitters, exactly as the sidecar bumps
 # PROTOCOL_VERSION and the module bumps its own constant.
 #
-# Current: 2 — the transport plus the read path (docs/rust-link/PROTOCOL.md §8).
-protocol = 3
+# Current: 4 — the transport, the read path, identity, and the permission mirror
+# (docs/rust-link/PROTOCOL.md §10).
+protocol = 4
 
 # ── Oxide compatibility ──────────────────────────────────────────────────────
 #