Rename rhemawave to radiantwave throughout

AGENTS.md

@@ -10,7 +10,7 @@ Dev shell via direnv (`use flake` in `.envrc`). Inside the nix dev shell:
 
 ```sh
 # Build
-go build -o bin/radiantwave radiantwave.go
+go build -o bin/radiantwave .
 
 # Run
 ./bin/radiantwave
@@ -48,7 +48,7 @@ Both run `nix build -L` on a self-hosted runner (`neils-server-runner`).
 
 ## Key Architecture
 
-- **Entry**: `rhemawave.go` → `internal/application.Run()`
+- **Entry**: `radiantwave.go` → `internal/application.Run()`
 - **State machine**: `internal/application/application.go` — FIRST_RUN → NEEDS_INTERNET → NEEDS_EMAIL_ADDRESS → NEEDS_LICENSE_KEY → DOWNLOADING_ASSETS → READY
 - **Pages**: `internal/page/` — router pattern with page interface (`page.go`)
 - **DB**: SQLite at `~/.local/share/radiantwave/database.sqlite`, managed by GORM in `internal/db/`