Add the Pico flasher id to the hand-off protocol

[bdraco]

What does this implement/fix?

Adds rp2-picoboot to the hand off flasher ids in flasher/src/protocol.ts, which mirrors the frontend contract. The flasher page here still lists only esp, so nothing else changes.

Related issue or feature (if applicable):

• part of Hand Raspberry Pi Pico firmware off to web.esphome.io when the dashboard can't flash it device-builder-frontend#1872

Types of changes

• Bugfix (non-breaking change which fixes an issue) — bugfix
• New feature (non-breaking change which adds functionality) — new-feature
• Enhancement to an existing feature — enhancement
• Breaking change (fix or feature that would cause existing functionality to not work as expected) — breaking-change
• Refactor (no behaviour change) — refactor
• Documentation only — docs
• Maintenance / chore — maintenance
• CI / workflow change — ci
• Dependencies bump — dependencies

Frontend coordination

• No frontend change needed
• Companion frontend PR: Hand Raspberry Pi Pico firmware off to web.esphome.io device-builder-frontend#1923

Checklist

• The code change is tested and works locally.
• Pre-commit hooks pass (ruff, codespell, yaml/json/python checks).
• Tests have been added or updated under tests/ where applicable.
• components.index.json / definitions/components/*.json have not been hand-edited (regenerate via script/sync_components.py if a sync is needed).
• Architecture-level changes are reflected in docs/ARCHITECTURE.md and/or docs/API.md.

[bdraco]

@esphbot review

[codspeed]

Merging this PR will not alter performance

✅ 28 untouched benchmarks
⏩ 1 skipped benchmark¹

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_{Comparing flasher-rp2-picoboot-id (f110077) with main (594bdec)}

Footnotes

1. 1 benchmark was skipped, so the baseline result was used instead. If it was deleted from the codebase, click here and archive it to remove it from the performance reports. ↩

[esphbot]

PR Review — Add the Pico flasher id to the hand-off protocol

Merge-ready. This is a small, contract-only change and I found no issues.

What the PR does well:

• It widens the HandoffFlasher union in flasher/src/protocol.ts:83 without changing any behaviour. flasher/src/main.ts:30 still sets FLASHERS to ["esp"] only, so this receiver keeps advertising esp alone.
• A frame that carries rp2-picoboot is still refused up front by the allowlist check at main.ts:198-200. That matches the PR description.
• There is no exhaustive switch on HandoffFlasher anywhere in flasher/src, so the wider union cannot break type-checking.
• The comment updates follow the existing pattern. The one-part-UF2-at-address-0 note now covers both UF2 flashers, and the note that ids are named after the flasher rather than the platform is kept.

No findings.

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Checklist

• No hardcoded secrets
• Backward-compatible protocol change (additive union member, receiver allowlist unchanged)
• PR description matches diff

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Automated review by Kōan (Claude) HEAD=f110077 11s

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.75%. Comparing base (594bdec) to head (f110077).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2859   +/-   ##
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  Coverage   99.75%   99.75%           
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  Files         296      296           
  Lines       25618    25618           
=======================================
  Hits        25556    25556           
  Misses         62       62           

Flag	Coverage Δ
py3.12	99.72% <ø> (+<0.01%)	⬆️
py3.14	99.60% <ø> (ø)

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[esphbot]

Tip

No blocking issues found — ready to merge.

[Copilot]

Copilot review overview

🟢 Approval recommended

No unresolved review issues were identified.

Review effort: Lite
Findings: None

What changed in this PR

Adds the rp2-picoboot identifier to the flasher hand-off protocol, aligning it with the frontend contract.

Changes:

• Extends HandoffFlasher with rp2-picoboot.
• Documents RP2040 UF2 hand-off behavior.

File	Description
flasher/​src/​protocol.ts	Adds and documents the Pico hand-off flasher ID.

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