fix(cli): non-elevated daemon management when the broker is serving (Windows)

[githubrobbi]

Symptom

On Windows, a non-elevated uffs --update fails to apply:

Error: Daemon management commands require an elevated (Administrator) shell.
…
Error: daemon did not stop within 20s (PID file lingered)
Error: uffs-update apply failed (exit Some(1)) — the helper rolled back + restored services

Even with the Access Broker installed and serving, you must open an elevated window to update — which defeats the broker's entire purpose (zero-UAC operation).

Root cause

The daemon-management elevation gate was hardcoded on Windows:

#[cfg(not(unix))]
const fn mutating_management_needs_elevation() -> bool { true }   // always

So every uffs --daemon stop/restart demanded elevation. The self-update quiesce drives uffs --daemon stop, the gate refused, the daemon never stopped, and apply rolled back. (Unix already gates intelligently on PID-file ownership; only Windows was blanket-true.)

Fix

On Windows, require elevation only when the broker pipe is NOT serving. With the broker up, the daemon runs non-elevated and a non-elevated caller can stop and restart it (restart adopts broker handles — no UAC), so there's no risk of stranding a daemon that can't be brought back. Without the broker, a restart needs admin to re-read the MFT, so elevation is still required.

The old #[cfg(not(unix))] true splits into #[cfg(windows)] (broker-aware) and #[cfg(not(any(unix, windows)))] (conservative true). Docs updated to match.

Result

The intended zero-UAC flow holds end-to-end: on a broker-equipped install, non-elevated uffs --update just works — no elevated window needed.

Verification

macOS build + x86_64-pc-windows-msvc cross-build + Windows clippy all clean; file stays within the 800-LOC policy.

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