fix(rp2350): harden Pico 2 W UF2 deploy

[zackees]

Summary

• accept canonical RP2350 UF2 images containing the RP2350-E9 absolute block while preserving family, sequence, address-range, and overlap validation
• prevent pre-existing BOOTSEL volumes from winning when an exact runtime CDC target was selected
• add a bundled rpipico2w build/deploy profile, aliases, CYW43 wiring flags, and a Pico 2 W test environment
• keep USB VID/PID ownership in the FastLED/boards registry

Hardware evidence

• target: Pico 2 W-compatible RP2350 board, serial 2DCB876B587EA334
• board-correct runtime: healthy COM17, 2E8A:F00F
• artifact: tests/platform/rpipico2/.fbuild/build/rpipico2w/release/firmware.uf2
• size: 688128 bytes
• SHA-256: A8E72528E1ED030D202B2D45EDCB397132545644F33D8DB6F08D879B153236A7
• compile identity includes ARDUINO_RASPBERRY_PI_PICO_2W, ARDUINO_ARCH_RP2040, PICO_RP2350, PICO_CYW43_SUPPORTED, and CYW43_PIN_WL_DYNAMIC
• three same-artifact deployments succeeded through fbuild deploy --transport uf2 --skip-build; the target re-enumerated with the same serial and healthy board-correct runtime identity
• after the final explicit COM17 deployment, the unrelated RP2040 G: volume retained the exact same unique ID, size, and free space
• operator visually confirmed the Pico 2 W onboard LED blink cadence

Validation

• soldr cargo test -p fbuild-deploy ? 261 passed, 13 hardware tests ignored
• soldr cargo test -p fbuild-config ? 215 passed, 1 live-registry test ignored
• soldr cargo fmt --all -- --check
• soldr cargo clippy -p fbuild-deploy --all-targets -- -D warnings
• soldr cargo clippy -p fbuild-config --all-targets -- -D warnings
• uv run --no-project python ci/check_usb_vidpid_literals.py
• pre-push review: 0 critical, 0 high, 0 medium, 0 low

The broad board-snapshot validator currently reports 51 pre-existing drifts in unrelated boards; it did not flag rpipico2w.

Addresses #1233

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📥 Commits

Reviewing files that changed from the base of the PR and between 7a4cd2f and 3cedab3.

📒 Files selected for processing (6)

• crates/fbuild-config/assets/boards/json/rpipico2w.json
• crates/fbuild-config/assets/boards/manifest.json
• crates/fbuild-config/src/board/db.rs
• crates/fbuild-config/src/board/tests_enriched_json.rs
• crates/fbuild-deploy/src/rp2040.rs
• tests/platform/rpipico2/platformio.ini

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