refactor: harden internal daemon entrypoint and cleanup observations

Remove the internal daemon subcommand from the public CLI surface,
start the daemon via an internal env trigger, and ensure generated
completions/help never expose internal entrypoints.

Also finish the pending observation cleanups and docs updates,
including config/key deduplication, registry matching cleanup, and
remaining roadmap/project map staleness fixes.

PROJECT_MAP.md

@@ -343,8 +343,9 @@ roku_password = ""
 
 ## What Has NOT Been Started
 
-- HTTP route handlers and request validation
 - CI/CD configuration
+  - Must pin Rust toolchain >= 1.85 because `edition = "2024"` is in use.
+- Cross-compile validation for `x86_64` and `aarch64`
 - Release/packaging
 
 ---