feat(node): several named roots per group, and one implementation per operation

Stage A — a group's content is a set of named roots
---------------------------------------------------
`shared_dir` becomes a list of {name, path, kind}. The name is the directory's
basename, derived once at add time and *stored*: recomputing it would
re-identify a whole library the day someone renames a folder on disk. Duplicate
names are refused case-insensitively and no root may contain another — both
compared with NFC folding, because most of these directories live on exFAT or
NTFS where `Films` and `films` are one directory.

Every index path carries its root name, in a one-root group as much as in a
five-root one. One path shape has to be got right once; two have to be kept
right for ever.

**A root that goes away freezes; it never empties.** Unmounting a volume makes
watchdog report every file under it as deleted, or presents an empty directory
to the next scan. Acting on either propagates deletions for a whole library to
every member, as though the owner had erased it. So a deletion is acted on only
once its root is confirmed readable, and availability is tracked per root — one
unplugged drive leaves the others serving. 12 tests, verified to fail against an
indexer without the check.

Events are not trusted to be complete either: ReadDirectoryChangesW drops them
under load and inotify on a FUSE mount misses changes made outside it. A
periodic reconciliation sweep is the only thing that recovers a missed event.

MNP 0.2 → 0.3 (additive). The hub needs no change: SwarmSource carries a content
hash, a node id and an endpoint — no paths, no filenames — and private groups
register nothing (H7).

Stage B — one implementation behind every front door
----------------------------------------------------
C1 and C6 were both "a second path into the node with its own weaker
handshake". Two implementations of `revoke` with two authorization checks is
that shape one size down. `meshbay_node/ops.py` holds each operation once,
takes the daemon state, and knows nothing about HTTP, argv or MNP. The loopback
API is one `_op(...)` line per endpoint; the MNP handlers call the same
functions. test_ops.py asserts the shape rather than trusting it.

Phase 14 is finished on top of it — `group list`, `gek init|rotate`, `reload`
(SIGHUP), `denylist show|clear`, `file list|rm`. **No operator action requires a
browser any more.** Plus `gek_rotate` and `member_unpin` as operator-signed MNP
operations: rotation is the half of revocation that revocation cannot do, since
the ex-member holds the current key, and the node generates the replacement
with its own CSPRNG — no key material crosses the wire, which is what the C5b
rule is actually about.

Two bugs found by running it rather than by testing it
------------------------------------------------------
GroupIndex is keyed by **content hash**, so the same bytes at two paths are one
entry — which is also why a scan reports ten files and indexes nine.
Reconciliation compared paths, so it decided the second path was a missed event
every 60 s, rewrote the entry and pushed an index update to every connected
peer. Seen in a live node's log.

`meshbay-node reload` crashed on first use with `subprocess` unimported: the
module compiles fine, which is the "syntax, not names" trap already recorded for
the SPA. test_cli_dispatch.py now walks every verb and refuses to let one be
added to the parser without an entry there.

Also corrected: protocol.py declared a second MNP_VERSION of "0.1" while the
wire carried "0.2" — harmless only because nothing imported it. And
_do_dir_create/_do_dir_delete referenced an undefined `filename` on their error
path.

740 tests pass; QE/deploy/e2e.py passes end to end against the live deployment.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

1 files changed, 36 insertions, 4 deletions

diff --git a/packages/meshbay-node/src/meshbay_node/transport/quic_server.py b/packages/meshbay-node/src/meshbay_node/transport/quic_server.py
index 73e668c..ce6fe17 100644
--- a/packages/meshbay-node/src/meshbay_node/transport/quic_server.py
+++ b/packages/meshbay-node/src/meshbay_node/transport/quic_server.py
@@ -35,6 +35,7 @@ from aioquic.quic.events import QuicEvent, StreamDataReceived, StreamReset
 from cryptography.hazmat.primitives.asymmetric.ed25519 import Ed25519PrivateKey
 
 from meshbay_common import MNP_VERSION
+from meshbay_node.roots import RootSet, entry_abs_path
 from meshbay_common.handshake import (
     NONCE_LEN,
     ROLE_CLIENT,
@@ -98,6 +99,37 @@ class Denylist:
         log.info("Denied jti: %s", jti[:8])
         self._save()
 
+    def entries(self) -> dict[str, list[str]]:
+        """What is currently refused, for the operator to inspect (14.10)."""
+        return {
+            "users": sorted(self.user_ids),
+            "groups": sorted(self.group_ids),
+            "jtis": sorted(self.jtis),
+        }
+
+    def clear(self, subject: str = "") -> int:
+        """
+        Drop everything, or one identifier. Returns how many entries went.
+
+        Not silent by design: clearing re-admits whoever it was keeping out, and
+        the count is what tells the operator whether they undid one revocation
+        or all of them.
+        """
+        before = len(self.user_ids) + len(self.group_ids) + len(self.jtis)
+        if subject:
+            self.user_ids.discard(subject)
+            self.group_ids.discard(subject)
+            self.jtis.discard(subject)
+        else:
+            self.user_ids.clear()
+            self.group_ids.clear()
+            self.jtis.clear()
+        after = len(self.user_ids) + len(self.group_ids) + len(self.jtis)
+        removed = before - after
+        if removed:
+            self._save()
+        return removed
+
     def _load(self) -> None:
         if not self._path or not self._path.exists():
             return
@@ -352,7 +384,7 @@ class _MNPServerProtocol(QuicConnectionProtocol):
             self._send(stream_id, {"type": "error", "detail": "File not found"})
             return
 
-        file_path = ctx["shared_root"] / entry.path / entry.name
+        file_path = entry_abs_path(ctx["roots"], entry)
         if not file_path.exists():
             self._send(stream_id, {"type": "error", "detail": "File not on disk"})
             return
@@ -379,7 +411,7 @@ class _MNPServerProtocol(QuicConnectionProtocol):
             self._send(stream_id, {"type": "error", "detail": "File not found"})
             return
 
-        file_path = ctx["shared_root"] / entry.path / entry.name
+        file_path = entry_abs_path(ctx["roots"], entry)
         if not file_path.exists():
             self._send(stream_id, {"type": "error", "detail": "File not on disk"})
             return
@@ -506,7 +538,7 @@ class QuicChunkServer:
         sk_node: Ed25519PrivateKey,
         hub_pk_pem: bytes,
         gek: bytes,
-        shared_root: Path,
+        roots: RootSet,
         index: GroupIndex,
         host: str = "::",   # listen IPv4 + IPv6 (dual-stack Linux)
         port: int = 19000,
@@ -519,7 +551,7 @@ class QuicChunkServer:
             "sk_node":     sk_node,
             "hub_pk_pem":  hub_pk_pem,
             "gek":         gek,
-            "shared_root": shared_root,
+            "roots": roots,
             "index":       index,
         }
         if groups: