feat: implement core Roku ECP adapter

Add SSDP discovery plus the main ECP app, state, and key control flows so
Milestone 2 has a working Roku foundation with parser and key-mapping tests.

ROADMAP.md

@@ -14,7 +14,7 @@ Foundation scaffold is complete. Begin platform implementation work.
 
 ## In Progress
 
-_Nothing in progress yet._
+- Roku adapter `dev_install()` and `dev_logs()` need developer-web credential handling plus real-device validation
 
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@@ -28,18 +28,18 @@ _Completed 2026-04-14. See Completed below._
 ## Milestone 2 — Roku Adapter
 _Goal: Can communicate with a real Roku TV over ECP._
 
-- [ ] Implement Roku ECP adapter in `src/adapters/roku/`
-- [ ] `discover()` — SSDP scan returning Roku devices
-- [ ] `list_apps()` — fetch installed channel list via ECP
-- [ ] `launch()` — launch app by ECP channel ID
-- [ ] `stop_app()` — exit current app
-- [ ] `key()` — send ECP keypress
-- [ ] `sequence()` — send multiple keypresses
-- [ ] `state()` — query power state and active app
+- [x] 2026-04-14 — Implement core Roku ECP adapter in `src/adapters/roku/`
+- [x] 2026-04-14 — `discover()` — SSDP scan returning Roku devices
+- [x] 2026-04-14 — `list_apps()` — fetch installed channel list via ECP
+- [x] 2026-04-14 — `launch()` — launch app by ECP channel ID
+- [x] 2026-04-14 — `stop_app()` — exit current app
+- [x] 2026-04-14 — `key()` — send ECP keypress
+- [x] 2026-04-14 — `sequence()` — send multiple keypresses
+- [x] 2026-04-14 — `state()` — query power state and active app
 - [ ] `dev_install()` — zip upload via ECP dev mode
-- [ ] `dev_reload()` — reload sideloaded app
+- [x] 2026-04-14 — `dev_reload()` — reload the sideloaded app via `launch/dev`
 - [ ] `dev_logs()` — fetch dev logs
-- [ ] Key translation table (TvKey → Roku ECP key string)
+- [x] 2026-04-14 — Key translation table (TvKey → Roku ECP key string)
 - [ ] Manual integration test against real Roku device
 
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@@ -155,6 +155,7 @@ out of scope until Milestone 6 is complete and stable.
 - [x] 2026-04-14 — Create module skeleton and placeholder docs layout
 - [x] 2026-04-14 — Define the adapter contract and core shared data types
 - [x] 2026-04-14 — Compile the project cleanly with `cargo build`
+- [x] 2026-04-14 — Add Roku ECP discovery, input, app, and state adapter support with unit tests
 
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