fix(rp): reacquire same-name CDC after BOOTSEL deploy

[zackees]

Summary

• exclude known-unhealthy RP CDC devnodes from the pre-flash name snapshot
• allow a stale Windows COM selector to use an unambiguous mounted BOOTSEL volume
• reacquire a healthy runtime CDC endpoint even when Windows reuses the same COM name

Why

A phantom COM record such as COM18 was counted as already present before an RP2350 UF2 flash. When the board returned healthy on COM18, post-flash discovery filtered it out solely because its name had not changed, so deploy returned no application port and AutoResearch could not continue.

Validation

• focused regression test: RED before helper, GREEN after implementation
• bash test -p fbuild-deploy — 288 passed, 13 ignored
• soldr cargo fmt --all -- --check
• soldr cargo clippy -p fbuild-deploy --all-targets -- -D warnings
• full bash test
• pre-push review clean
• hardware HIL pending completion of the coordinated FastLED run

Closes #1404
Coordinated with FastLED/FastLED#4062.

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📥 Commits

Reviewing files that changed from the base of the PR and between 3713843 and de07334.

📒 Files selected for processing (2)

• crates/fbuild-deploy/src/rp2040.rs
• crates/fbuild-deploy/src/rp2040_target.rs

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[zackees]

Rebased onto current main (2.5.24) and marked ready. After the rebase: bash test -p fbuild-deploy 288 passed / 13 ignored, clippy -D warnings clean, fmt --check clean.

Not done: the hardware HIL run. The coordinated FastLED PR (FastLED/FastLED#4062) was closed without merging, so that run never happened. The change is covered by the focused RED→GREEN regression test, but the Windows RP2350 same-name COM reacquisition itself is unverified on hardware.

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