fix(fish): prevent file completions and glob expansion in gt.fish

- Add -f (--no-files) flag to all complete entries to block file/path
  completions for the gt command
- Escape ** and * arguments to prevent fish from glob-expanding them
  into recursive file matches
- Add Shell Completions section and completions row to README.md

1 files changed, 15 insertions, 0 deletions

diff --git a/README.md b/README.md
index 565f396..cffb09d 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,20 @@ gt '100Mbps 1hr *'      # rate × time → 3.6e+11 bits
 gt                      # interactive REPL
 ```
 
+## Shell Completions
+
+Fish completions are available in [`completions/`](completions/). To install:
+
+```bash
+cp completions/gt.fish ~/.config/fish/completions/
+```
+
+Or system-wide:
+
+```bash
+sudo cp completions/gt.fish /usr/local/share/fish/vendor_completions.d/
+```
+
 ## Feature Guide
 
 All features are documented in [`docs/`](docs/):
@@ -51,6 +65,7 @@ All features are documented in [`docs/`](docs/):
 | Custom metrics | [custom-metrics](docs/custom-metrics.md) |
 | REPL mode | [repl-mode](docs/repl-mode.md) |
 | Rational number mode | [rational-mode](docs/rational-mode.md) |
+| Fish shell completions | [completions](completions/)
 
 ## Building and Testing