Merge branch 'refactor/groups-phase1'

Groups refactor, phases 1-3.

The root model replaces the old `upload` flag and group-wide `member_upload`
with per-root `writable`/`removable`/`ejected`, carried by a `RootSet` that
both front doors — the loopback API and signed MNP — reach through the same
`ops` functions. MNP goes to 1.1, additively: the roots table now rides on
`index_delta`, so a root added, removed, ejected or plugged reaches every
connected client instead of only whoever reloaded.

The group UI becomes a plugin architecture: an application is a registry
entry in `apps.js` plus its own files, with directories stored generically
by `ops.set_app_directories` under whatever the app is called. A reference
application, hidden behind `?dev=1`, is what makes that claim testable —
adding it is what found the two places still naming apps by hand.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011pvMdvLBG92jyhvD5pD6us

1 files changed, 7 insertions, 3 deletions

diff --git a/packages/meshbay-node/tests/conftest.py b/packages/meshbay-node/tests/conftest.py
index 20724aa..3dc9cd9 100644
--- a/packages/meshbay-node/tests/conftest.py
+++ b/packages/meshbay-node/tests/conftest.py
@@ -24,14 +24,18 @@ win32_todo = pytest.mark.skipif(
 )
 
 
-def one_root(path: Path, *, name: str = "", kind: str = "generic") -> RootSet:
+def one_root(path: Path, *, name: str = "", kind: str = "generic",
+             writable: bool = True) -> RootSet:
     """
-    A RootSet with a single root over `path`, receiving uploads.
+    A RootSet with a single writable root over `path`.
 
     The equivalent of the old `shared_dir`. Note what it implies for assertions:
     a file directly in `path` now has `entry.path == <basename of path>`, not
     `""` — every index path carries its root name, in a group with one root as
     much as in a group with five.
+
+    Writable by default because most callers are testing something else and
+    want a root an upload can reach. `writable=False` is the read-only group.
     """
     return RootSet.build([{"path": str(path), "name": name, "kind": kind,
-                           "upload": True}])
+                           "writable": writable}])