* refactor(desktop): remove the onboarding intro cinematic and the guided-onboarding tests
The guided first run now opens straight into the guide: the gate's
`cinematic` phase becomes `pending`, and OnboardingChatGate owes the guide
on mount (the old HERMES_SKIP_INTRO path, now the only path). Removes the
native intro window, its IPC bridge, the `?win=intro` renderer, its assets,
and the skipIntro launch flag. Deletes the guided-onboarding test files ahead
of the rewrite, plus the reset helpers only they called.
* refactor(onboarding): strip comments from the guided-onboarding modules
Clears comments and docstrings from the guided-onboarding files ahead of
their rewrite, desktop and backend. Lint and type pragmas stay. No code
changes.
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