Users have reported confusion about "when will ClawPanel update its
gateway protocol to v4". This is actually a misreading: ClawPanel v0.15+
already advertises `minProtocol=3, maxProtocol=4` in its connect frame,
and negotiates v4 transparently when the kernel is >= 2026.5.12. The
`v3|` prefix users were seeing in dev-api.js is the device signature
payload string schema version, which is a completely separate concept
from the handshake protocol version.
Make this visible and unambiguous:
UI
- Add a "Proto v4" badge next to the Gateway service name in
/services once the WS handshake succeeds, with a tooltip explaining
that this is the WS handshake protocol version (not the device
signature payload v3 format).
- Add the same protocol info to the WebSocket row in /chat-debug.
API
- WsClient now exposes `negotiatedProtocol` which prefers the explicit
field from the hello payload (`protocol` / `protocolVersion` /
`negotiatedProtocol`) and falls back to inferring from serverVersion:
kernels >= 2026.5.12 are reported as v4, older as v3. This matches
the panel's advertised range of [3, 4].
- KernelSnapshot grows a `protocol` field so feature gates and UIs that
already consume the snapshot can read it without touching wsClient.
Comments
- Expand the KERNEL_TARGET comment in feature-catalog.js to spell out
the two-distinct-version-numbers rule explicitly.
- Add matching clarifying comments next to the `v3|...` payload string
in both scripts/dev-api.js and src-tauri/src/commands/device.rs, so
the next reader does not confuse payload schema with handshake.
## Verification
- node --check on all touched JS files
- npm run build
- cargo fmt --check && cargo check (clippy errors that surface are
pre-existing debt in config.rs, untouched here)
- Playwright /services: mock wsClient state, observe `协议 v4` badge
rendered with `rgba(99, 102, 241, 0.1)` background and accent color,
for both the explicit-protocol path and the version-inferred path.
