feat(zap): PT2260 lighting controls — Tasks 1–5 (no hardware)

[metaframework-dispatch-bot]

Summary

Tasks 1–5 from the implementation plan — no hardware required. Tasks 6 & 7 (RTL-SDR capture, lamp verification) stay Tom-in-the-loop and land after this merges.

• Task 1 — PT2260 tri-state pulse-train encoder + resolve_code() (per-unit codes under units.<name>.codes.on/off) in src/device.py.
• Task 2 — pulses payload builder with firmware-mirrored validation limits (µs 1..100000, 1..256 pairs, repeat_count 1..100, total-duration budget ≤ 5,000,000 µs).
• Task 3 — Generic {pulses, repeat_count} shape on POST /transmit in firmware/src/main.cpp. Legacy {bits, timing} and /fan/* routes untouched. Watchdog fed inside the pulse-pair loop; PT2260 sync pair is the last element and every pair ends LOW (per spec §4).
• Task 4 — CLI (cli.py) routes PT2260 profiles through the pulse-train payload path; validates commands per encoding (fan on/off/hi/med/lo, PT2260 codes live under units.<unit>.codes.<command>).
• Task 5 — scripts/export_web_devices.py derives the PWA's devices.json from devices/zap_lights.yaml — one source of truth.

Firmware code compiles but requires a Tom flash before Task 7 (lamp verification). All host-side tests pass.

Test plan

• 62 tests, 0.17s
• Ruff format + check: clean
• Task 6 (RTL-SDR capture): Tom's next step — rtl_433 -f 433.92M -A -S unknown on the living-room remote's 8 buttons, populate devices/zap_lights.yaml codes
• Task 7 (lamp verification): after 6 + firmware flash, python cli.py PROFILE UNIT COMMAND for each of the four outlets

Captured test run (showboat)

Issue #12 Tasks 1-5 test run

2026-07-14T00:53:52Z by Showboat 0.6.1

uv run pytest

warning: `VIRTUAL_ENV=/Users/tom/Documents/work/metaframework/.venv` does not match the project environment path `.venv` and will be ignored; use `--active` to target the active environment instead
============================= test session starts ==============================
platform darwin -- Python 3.13.7, pytest-9.0.2, pluggy-1.6.0
rootdir: /Users/tom/Documents/work/radiofrequency
configfile: pyproject.toml
testpaths: tests
plugins: anyio-4.13.0
collected 62 items

tests/test_cli.py ......                                                 [  9%]
tests/test_device.py ..................................                  [ 64%]
tests/test_export_web_devices.py .                                       [ 66%]
tests/tpms/test_api.py .......                                           [ 77%]
tests/tpms/test_db.py ......                                             [ 87%]
tests/tpms/test_ingest.py ........                                       [100%]

============================== 62 passed in 0.17s ==============================

Closes #12

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