Migrate codes to Flipper .sub format with lazy loader

[balloob]

Summary

• Adopt Flipper Zero .sub as the code storage format. Codes live under rf_protocols/codes/<vendor>/<device>/<command>.sub in Flipper's standard RAW SubGhz format. Captures taken on an actual Flipper drop in as-is, and anything we add here can be used directly by Flipper users — promotes reuse of existing work in both directions. Honeywell string lights is migrated as the first example.
• Lazy loader. New load_codes(path, base_dir=None) returns a CodeCollection. It resolves the device directory (and rejects path traversal) but does not read any .sub file. CodeCollection.load_command(name) is where the file read + parse happens, cached per instance so repeat calls don't re-read. This keeps HA startup cheap and defers work until a command is actually sent.
• Simplify timings. OOKCommand.timings is now list[int] using Flipper's signed-alternating convention (positive pulse µs, negative space µs) instead of a Timing dataclass. The .sub values are stored verbatim — no conversion layer — and the Timing class is dropped entirely.

Usage:

from rf_protocols import load_codes

codes = load_codes("honeywell/string_lights")  # resolves dir, no file reads
cmd = codes.load_command("TURN_ON")            # reads + parses one .sub file

Test plan

• pytest — 21 tests pass, including a parametrized test that walks every bundled .sub file and asserts it parses into a valid OOK command
• ruff check / ruff format / basedpyright clean via prek --all-files
• Wire up in a downstream HA integration to confirm the load_codes / load_command split feels right in practice

🤖 Generated with Claude Code