adapter.py was a 3,493-line monolith. Split it into focused modules with clear separation of responsibilities, bringing it down to ~857 lines: - Module-level helpers: hooks, classify, pickers, commands, setup, defaults, secrets - Frame-handler mixins: inbound, tool_frames, push_frames, media_frames, picker_frames, channel_frames, query_frames - mixin_base: IrisAdapterBase (declaration-only base for shared attrs) - adapter.py now holds only IrisAdapter (the composition of the 7 mixins + BasePlatformAdapter), register(), and test-facing re-exports The mixins come before BasePlatformAdapter in the MRO so their methods override the base; super() calls (e.g. send_image) still resolve to BasePlatformAdapter. No circular imports; dispatch.py and http_server.py (instance-method callers) are unaffected. Ruff complexity ceilings (PLR0911/0912/0913/0915) restored to Ruff's built-in defaults (12/50/6/5) instead of "just above the current maxima", which ratchets the bar down as code grows. The existing genuinely-complex functions (frame builders mirroring the wire schema, the QR matrix builder, the dispatch table) carry an explicit `# noqa: PLR09xx` marking them as reviewed, frozen exceptions; new code is held to the default ceilings. All 125 tests green (94 test_android + 31 test_android_http); no new ruff errors introduced.