feat: V13 — per-card "re-match this one file" (MNP 0.13)

A one-click alternative to the full "Fix match" search-and-pick flow, and
reachable without SSH (`meshbay-node video rematch` clears a whole group).

- MNP 0.13: tmdb_rematch / tmdb_rematch_ack (additive — an older node
  logs "unknown type", the button just does nothing). OP_TMDB_REMATCH,
  signed like tmdb_override (media_cache is shared node-wide).
- media_cache.drop_tmdb_match(file_id): forgets the match AND the
  override marker — deliberately stronger than clear_file_tmdb, since the
  operator is explicitly asking for a fresh resolution.
- webrtc_server: _do_tmdb_rematch / _admin_exec_tmdb_rematch, dispatch +
  admin-response routing, broadcasts tmdb_rematch_ack.
- transport.js: rematchTmdbMatch(fileId, signFn); 'tmdb_rematch' in the
  admin-op allowlist; tmdb_rematch_ack handled like tmdb_override_ack.
- video-app.js: a "Re-match" button beside "Fix match" in the detail
  modal (isNodeAdmin), then bumpMediaMetaGeneration(). video.rematch_one
  key in all ten locales.

docs/mediacenter.md §10.1: V8–V13 marked done.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018BMLQjqFGCize2KtNBT79v

3 files changed, 12 insertions, 1 deletions

diff --git a/packages/meshbay-common/src/meshbay_common/__init__.py b/packages/meshbay-common/src/meshbay_common/__init__.py
index d40f647..4612157 100644
--- a/packages/meshbay-common/src/meshbay_common/__init__.py
+++ b/packages/meshbay-common/src/meshbay_common/__init__.py
@@ -52,5 +52,9 @@ __version__ = "0.8.0"
 # 0.12: added `link_preview_req`/`link_preview_resp` — the node unfurls a URL
 # pasted in chat into an OpenGraph card. Additive: an older node logs "unknown
 # type" and the client just shows the bare link, as it always did.
-MNP_VERSION = "0.12"
+# 0.13: added `tmdb_rematch`/`tmdb_rematch_ack` — an operator dropping one
+# file's cached TMDB match so it re-resolves with the current matcher
+# (§10.1/V13). Additive: an older node logs "unknown type", the client's
+# button just does nothing.
+MNP_VERSION = "0.13"
 MHP_VERSION = "0.1"
diff --git a/packages/meshbay-common/src/meshbay_common/adminop.py b/packages/meshbay-common/src/meshbay_common/adminop.py
index f96dd57..762a2d1 100644
--- a/packages/meshbay-common/src/meshbay_common/adminop.py
+++ b/packages/meshbay-common/src/meshbay_common/adminop.py
@@ -83,6 +83,11 @@ OP_VIDEO_ROOT = "video_root"
 # (media_cache is shared, not per-viewer), so an unsigned override would let
 # any member vandalize another show's metadata.
 OP_TMDB_OVERRIDE = "tmdb_override"
+# "Re-match this one file" — drop its cached match (and any override marker)
+# so the next media_meta_req re-resolves with the current matcher. Signed for
+# the same reason as tmdb_override: media_cache is shared node-wide, so an
+# unsigned reset would let any member wipe another's correction.
+OP_TMDB_REMATCH = "tmdb_rematch"
 # MusicBrainz contact is now the owner's hub email (musicbrainz.py) — no
 # signed config op needed. Only the per-group toggle remains.
 # Whether the node calls MusicBrainz *at all* for this group — per-group from
diff --git a/packages/meshbay-common/src/meshbay_common/protocol.py b/packages/meshbay-common/src/meshbay_common/protocol.py
index 651fe2d..a3fb4de 100644
--- a/packages/meshbay-common/src/meshbay_common/protocol.py
+++ b/packages/meshbay-common/src/meshbay_common/protocol.py
@@ -109,6 +109,8 @@ class MNP:
     TMDB_SEARCH_RESP      = "tmdb_search_resp"       # node → client: candidate list (id, title, year, poster)
     TMDB_OVERRIDE         = "tmdb_override"          # operator → node: replace a show/movie's TMDB match
     TMDB_OVERRIDE_ACK     = "tmdb_override_ack"
+    TMDB_REMATCH          = "tmdb_rematch"           # operator → node: drop one file's match
+    TMDB_REMATCH_ACK      = "tmdb_rematch_ack"
     # Music app (docs/musicbay.md). Contact is derived from the owner's hub
     # email at login — no config/ack pair needed. Only the per-group toggle
     # remains.