fix: document config-local Ruby lint policy

TODO.md

@@ -1,5 +1,8 @@
 - [x] command autocompletion via `tab` (multiple presses cycles candidates)
-- [ ] fix ruby linting for the vamp config file (see attached image)
+- [x] fix ruby linting for the vamp config file (see attached image)
+- [ ] execute terminal commands asynchronously using the `!` prefix (e.g. `!pwd`) and display the output in a floating window.
+    - while waiting on the result of the executed command, show a spinner in a new element right of the battery status in the top bar (top-right corner)
+    - indicate also the command that we're waiting on, maybe something like the first three characters (followed by ellipses if truncated), e.g. `pwd <spinner>` or if the command was `echo $PATH`, then `ech... <spinner>`.
 - [ ] diff view: GitHub code review integration after the local review UX is usable.
 	- publish local reviews explicitly: general PR comments, inline line/range comments, review summaries, approval, and requests for changes.
 	- preserve explicit PR identity and reviewed commit IDs; validate anchors against GitHub's PR diff and recheck the PR head before submission.

docs/configuration.md

@@ -396,6 +396,24 @@ Only `command`, `extensions`, `initialization_options`, `settings`, and `servers
 
 Install Solargraph yourself with `gem install solargraph` in the project's Ruby environment. The Ruby preset launches `["solargraph", "stdio"]`, following [Solargraph's stdio integration](https://solargraph.org/guides/language-server), and uses [YARD annotations](https://solargraph.org/guides/yard) for type information. Explicit `command` overrides replace the entire argv: for a bundled installation, use `config.lsp["ruby"] = { command: ["bundle", "exec", "solargraph", "stdio"] }`; Vamp retains the `rb` extension but does not append `stdio` to your override.
 
+**Config-file lint style:** Solargraph's RuboCop reporter discovers `.rubocop.yml` from the Ruby file's directory, not Vamp's workspace. A config under `~/.config/vamp/` therefore does not inherit this repository's policy. To keep double quotes, multiline trailing argument commas, commented-out settings without a space after `#`, and no required frozen-string header, place this `.rubocop.yml` beside `config.rb` (also for a custom `--config` path):
+
+```yaml
+Style/StringLiterals:
+  EnforcedStyle: double_quotes
+
+Style/TrailingCommaInArguments:
+  EnforcedStyleForMultiline: comma
+
+Style/FrozenStringLiteralComment:
+  Enabled: false
+
+Layout/LeadingCommentSpace:
+  Enabled: false
+```
+
+Syntax errors and other lint checks remain enabled. Restart Vamp after changing the policy so Solargraph reloads it; the Ruby config itself need not change.
+
 **Python (Astral):** install [ty](https://docs.astral.sh/ty/editors/) and [Ruff](https://docs.astral.sh/ruff/editors/setup/) yourself, for example with `uv tool install ty` and `uv tool install ruff`. The Python preset sends the same documents to both servers, uses ty for hover/definition, and merges type errors with Ruff lint diagnostics. Clearing or losing one server preserves the other's diagnostics. Formatting and code actions remain unsupported by Vamp.
 
 Use `servers` to customize the stack independently; order selects the hover/definition/completion server: