feat: let the operator pause and resume a root's indexing (MNP 6.2)

A whole-root walk now checks its root before every file: removed or
ejected, it stops instead of reading the drive to the end; paused, it
finishes from the hash cache alone. A paused root is not watched, not
swept by reconcile and survives a restart (roster), its indexed files
stay served. Resume runs the reconcile sweep over the root, so entries
and their enrichment are kept.

Signed root_pause / root_resume over MNP, loopback routes, CLI
`root pause|resume`, a pause button on the indexing dock and
pause/resume in the roots table of Group settings.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/packages/meshbay-common/src/meshbay_common/protocol.py b/packages/meshbay-common/src/meshbay_common/protocol.py
index 5073b66..e5ceaa7 100644
--- a/packages/meshbay-common/src/meshbay_common/protocol.py
+++ b/packages/meshbay-common/src/meshbay_common/protocol.py
@@ -252,6 +252,12 @@ class MNP:
     ROOT_EJECT_ACK       = "root_eject_ack"
     ROOT_PLUG            = "root_plug"             # operator → node: re-enable an ejected root
     ROOT_PLUG_ACK        = "root_plug_ack"
+    # Operator → node: stop / restart indexing one root (MNP 6.2). The acks are
+    # broadcast, like eject's, so every open table shows the new state.
+    ROOT_PAUSE           = "root_pause"
+    ROOT_PAUSE_ACK       = "root_pause_ack"
+    ROOT_RESUME          = "root_resume"
+    ROOT_RESUME_ACK      = "root_resume_ack"
     # Member → node: who is in this group and which device keys they hold, with
     # the countersignature that admitted each one. Scoped to one group and
     # answers any member of it, because the point is that a member