pi-chrome 0.13.0: flatten /chrome tree, cycle-on-pick for clicks/quiet, status header

Reorganises the /chrome command surface:

  /chrome status   - one-line snapshot of connection + click mode + quiet mode
  /chrome doctor   - full health check (unchanged)
  /chrome onboard  - install extension (unchanged)
  /chrome clicks   - cycles auto -> on -> off -> auto when called with no args.
                     Explicit args (auto|off|on|status) still work.
  /chrome quiet    - toggles on/off when called with no args.
                     Explicit args (on|off|toggle|status) still work.

Removes the nested 'settings' wrapper. /chrome settings background/trusted
still functions as a hidden legacy alias but is no longer advertised.

Bare /chrome opens a picker with a one-line status header and cycle-target
labels: 'clicks: auto -> switch to on' / 'quiet: off -> switch to on'. No
second picker; one keypress flips the setting.

Argument autocomplete now returns full-path values (e.g. 'clicks auto') so
pi-tui's whole-argument replacement applies correctly. Top-level suggestions
show clicks / quiet / status / doctor / onboard with descriptions.

User-visible names match the descriptive copy:
  - 'trusted' -> 'clicks' (matches 'real-looking clicks' / 'quiet clicks')
  - 'background' -> 'quiet' (matches 'quiet mode' / 'watch mode')

README + agent prompt primer + internal hint strings updated.

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