feat: complete daemon core milestone

Finish Milestone 3 with persisted config, socket IPC, registry CRUD,
periodic discovery, manual add, and app-cache refresh support.

PROJECT_MAP.md

@@ -19,7 +19,7 @@ script and control smart TVs through a stable, brand-agnostic API.
 
 ## Project Status
 
-**Phase:** Milestone 2 complete. Roku adapter is live-validated; daemon and CLI wiring are next.
+**Phase:** Milestone 4 in progress. Daemon core is complete; CLI coverage is expanding beyond daemon/device/app-cache operations.
 **Platform v1:** Roku only (via ECP HTTP API)
 **Language:** Rust
 **Crate type:** Binary (single binary distribution target)
@@ -49,6 +49,8 @@ tvctl/
 │   │   └── mod.rs
 │   ├── daemon/             ← tvctld daemon core scaffolding
 │   │   ├── mod.rs
+│   │   ├── config.rs       ← Config loading and runtime path helpers
+│   │   ├── ipc.rs          ← Unix socket request/response protocol
 │   │   ├── registry.rs     ← Device registry
 │   │   ├── discovery.rs    ← SSDP discovery service
 │   │   ├── cache.rs        ← App cache manager
@@ -335,9 +337,9 @@ enabled = true
 
 ## What Has NOT Been Started
 
-- Daemon runtime, socket transport, and persistence logic
 - HTTP route handlers and request validation
-- Real CLI command handling beyond skeleton parsing
+- CLI command handling for remote/state/dev/config flows
+- Daemon install/uninstall helpers and systemd unit generation
 - CI/CD configuration
 - Release/packaging