feat(debug): include desktop.log in hermes debug share / /debug / hermes logs (#38203)

The Electron desktop app writes boot failures, backend spawn output, and
Python tracebacks to HERMES_HOME/logs/desktop.log, but debug-share only
captured agent/errors/gateway — so desktop boot issues never made it into
shared debug reports.

- logs.py: register desktop -> desktop.log (enables 'hermes logs desktop')
- debug.py: capture desktop snapshot, add to summary report, upload full
  desktop.log in 'share', update privacy notice
- gateway /debug inherits the desktop tail via collect_debug_report()
- main.py + docs: help text and log-name table (also adds missing gui row)
- tests: desktop seed in fixture, new report test, three_pastes -> four_pastes

website/docs/reference/cli-commands.md

@@ -835,6 +835,8 @@ View, tail, and filter Hermes log files. All logs are stored in `~/.hermes/logs/
 | `agent` (default) | `agent.log` | All agent activity — API calls, tool dispatch, session lifecycle (INFO and above) |
 | `errors` | `errors.log` | Warnings and errors only — a filtered subset of agent.log |
 | `gateway` | `gateway.log` | Messaging gateway activity — platform connections, message dispatch, webhook events |
+| `gui` | `gui.log` | Dashboard / TUI-gateway / PTY-bridge / websocket events |
+| `desktop` | `desktop.log` | Electron desktop app — boot, backend spawn output, and recent Python tracebacks |
 
 ### Options