feat(windows): add scoped USB recovery helper foundation

[zackees]

Fixes #1148\n\nImplements the scoped recovery foundation without elevating or restarting the daemon:\n- typed core recovery request/result and explicit deploy policy;\n- hidden current-executable helper routed before daemon setup;\n- constrained Config Manager identity revalidation and only parent re-enumeration/exact-child restart;\n- UAC launcher with nonce-bound create-new rendezvous, cancellation cleanup, and reparse-point rejection;\n- deterministic policy, identity, and operation-allowlist tests.\n\nRP2040 is intentionally not yet wired to emit or consume the typed request; #1147 remains the sole integration/hardware-validation child.\n\nValidation:\n- soldr cargo test -p fbuild-serial usb_recovery\n- soldr cargo test -p fbuild-cli usb_recovery\n- soldr cargo test -p fbuild-cli deploy_admin_and_no_admin_conflict\n- soldr cargo test -p fbuild-cli hidden_usb_recovery_helper_arguments_parse\n- soldr cargo check -p fbuild-cli -p fbuild-daemon\n- soldr cargo clippy -p fbuild-core -p fbuild-serial -p fbuild-cli -p fbuild-daemon --all-targets -- -D warnings

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Review details

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Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

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Run ID: 7a6e10b2-159f-49cd-adbb-857f0f19b348

📥 Commits

Reviewing files that changed from the base of the PR and between 66f73ac and 5bce453.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (15)

• crates/fbuild-cli/Cargo.toml
• crates/fbuild-cli/src/cli/args.rs
• crates/fbuild-cli/src/cli/deploy.rs
• crates/fbuild-cli/src/cli/dispatch.rs
• crates/fbuild-cli/src/cli/mod.rs
• crates/fbuild-cli/src/cli/tests.rs
• crates/fbuild-cli/src/cli/usb_recovery.rs
• crates/fbuild-cli/src/daemon_client/types.rs
• crates/fbuild-cli/src/mcp/tools.rs
• crates/fbuild-core/src/usb/mod.rs
• crates/fbuild-core/src/usb/recovery.rs
• crates/fbuild-daemon/src/models.rs
• crates/fbuild-serial/Cargo.toml
• crates/fbuild-serial/src/lib.rs
• crates/fbuild-serial/src/usb_recovery.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/1148-usb-recovery

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