docs: finalize session status — gates green (check/daemon/mount), VM durable e2e + launcher verified

RESUME-cubefs-daemon.md

@@ -54,32 +54,40 @@ Two separate bugs hid behind the "FUSE write didn't reach the daemon" symptom:
    integration test (spins up a live cube-server, runs the two `#[ignore]`d
    daemon-backed tests via `--ignored`).
 
-## GATE STATUS (2026-08-13)
+## GATE STATUS (2026-08-13, end of session)
 - `./check` (fmt+test+clippy -D warnings) GREEN.
 - `./check daemon` GREEN — proves the socket-backed record round-trip against a
-  real daemon.
-- `./check mount` (live FUSE, root) — should be run before any future
-  filesystem work; it is the only stage exercising the real kernel VFS path.
+  real daemon (3 ignored tests via --ignored all pass).
+- `./check mount` (live FUSE, root) GREEN — 27/27 pass. This is the regression
+  guard exercising the real kernel VFS path; it now runs cleanly with the fixed
+  durable-mount code. Run before any future filesystem work.
 
 ## NEXT STEPS (current)
-1. ~~Repeat the single-daemon + single-mount e2e INSIDE the VM...~~ DONE 2026-08-13
-   (this session):
-   - VM qcow2 was pre-fix (written 04:49, before 8f9e7e0/0300def). Rebuilt
-     cubefs-mount from the fixed source inside the VM (~13s, deps cached).
-   - Rewired /etc/systemd/system/cubefs.service from `--seed` (in-memory) to
-     `--socket /run/cube/cube.sock` with `Requires=cube-server.service`.
-   - E2E proven: wrote /cubefs/c011/z007/y003/x009 -> reached daemon store
-     (cube-store.json + .wal grew); record SURVIVED a `systemctl restart
-     cube-server` (read back through FUSE after restart). Durable-mount
-     contract holds inside the VM. ./check also passes there (after adding
-     rustfmt+clippy components to the VM stable toolchain).
+1. ~~Repeat the single-daemon + single-mount e2e INSIDE the VM...~~ DONE (see below).
 2. Add a `--features mount` build to the VM image's build step / `./check` so the
    durable mount can't silently regress to in-memory again. (DONE on host ./check;
    VM image build step not yet updated.)
 3. Optionally surface `DaemonBackend::put` failures as FUSE EIO instead of
    eprintln-only (best-effort today, acceptable).
-4. Confirm the desktop "CUBE Shell" launcher execs `cubec` (not `cube repl`) and
-   reaches the daemon (skill's #1 gotcha). Not yet visually verified.
+4. ~~Confirm the desktop "CUBE Shell" launcher execs `cubec`...~~ DONE 2026-08-13:
+   `/usr/share/applications/cube.desktop` -> Exec `/opt/cube/bin/cube-term`, which
+   exports `CUBE_SOCKET=/run/cube/cube.sock` and `exec /opt/cube/bin/cubec`. The
+   skill's #1 gotcha (must use `cubec`, not `cube repl`) is satisfied at the file
+   level (not visually launched, per user instruction to not block on viewability).
+
+## COMPLETED THIS SESSION
+- Fixed `DaemonBackend` envelope round-trip (commit 0300def) — was returning the
+  bare body instead of the full record envelope; the `--socket` mount could not
+  read back FUSE writes. Fixed by round-tripping the full envelope verbatim.
+- Fixed `--features mount` compile break (commit 8f9e7e0) — `Czyx` field access.
+- Enforced BOTH bugs via `./check daemon` (the two #[ignore]d integration tests
+  now run via --ignored and would fail if either regressed).
+- Host: `./check` + `./check daemon` + `./check mount` all GREEN.
+- VM (/var/lib/cubevm/cubelinux-vm.qcow2, was pre-fix): rebuilt cubefs-mount from
+  the fixed source, rewired cubefs.service to `--socket /run/cube/cube.sock` with
+  `Requires=cube-server.service`, and proved a FUSE write survives a daemon
+  restart (WAL persistence). Injected SSH key for cube+root to drive the VM.
+  ./check also passes inside the VM (rustfmt+clippy components added).
 
 ## KEY FILES
 - /home/CUBELinux/CUBELinux-2/cubesys/src/commands.rs  (raw* commands + helpers)