command and help ux pass (#21)

Reviewed-on: #21
Co-authored-by: vickydotbat <vickydotbat@tutamail.com>
Co-committed-by: vickydotbat <vickydotbat@tutamail.com>

README.md

@@ -29,7 +29,7 @@ command lands is mapped in [`docs/command-surface.md`](docs/command-surface.md).
 
 ## Status (cutover performed)
 
-The internal `app`/`pipeline`/`project`/`erf`/`gff`/`topdata`/`music`/`changelog`/
+The internal `app`/`pipeline`/`project`/`erf`/`gff`/`topdata`/`changelog`/
 `validator` packages from `gitea/sow-tools` have been migrated into this tree, and
 the `module`, `topdata`, `hak`, and `wiki` builders now **delegate to the migrated
 `nwn-tool` command surface** (mapped in
@@ -49,7 +49,7 @@ which downloads the latest released `crucible` for your OS and runs it:
 ```bash
 ./crucible            # interactive menu (pick a command)
 ./crucible module build
-./crucible topdata validate-topdata
+./crucible topdata validate
 ```
 
 Windows (PowerShell):
@@ -62,15 +62,12 @@ The binary is cached under `~/.cache/crucible/<version>/` (`%LOCALAPPDATA%\cruci
 on Windows); `--repo-local` caches inside the repo instead. Private releases:
 set `CRUCIBLE_TOKEN` or write the token to `~/.config/crucible/token`.
 
-Only the **music** builder needs `ffmpeg`; everything else has zero dependencies.
-If you run a music command without it, Crucible prints a per-OS install hint.
-
 ## Develop
 
 Self-contained (D8) — a host with only Nix can run everything:
 
 ```bash
-nix develop            # Go + ffmpeg + shellcheck + yamllint + make
+nix develop            # Go + shellcheck + yamllint + make
 make check             # go vet + go test + shellcheck + yamllint
 make build             # build every cmd/* into ./bin (gitignored)
 make smoke             # build + assert the fail-closed contract