Add completion spec: tree

[lucieleblanc]

Summary

Add command completion spec for tree, a recursive directory listing utility.

Addresses APP-3957.

What's included

• JSON spec (command-signatures/json/tree.json) covering all flags/options from tree --help and Fish shell completions
• Listing options: -a, -d, -l, -f, -x, -L, -R, -P, -I, --gitignore, --gitfile, --ignore-case, --matchdirs, --metafirst, --prune, --info, --infofile, --noreport, --charset, --filelimit, -o
• File options: -q, -N, -Q, -p, -u, -g, -s, -h, --si, --du, -D, --timefmt, -F, --inodes, --device
• Sorting options: -v, -t, -c, -U, -r, --dirsfirst, --filesfirst, --sort (with static suggestions: name, version, size, mtime, ctime)
• Graphics options: -i, -A, -S, -n, -C
• XML/HTML/JSON options: -X, -J, -H, -T, --nolinks, --hintro, --houtro
• Input options: --fromfile, --fromtabfile, --fflinks
• Misc: --version, --help
• Positional argument accepts variadic optional folders (using the folders template)

No generators

This command uses only static flags, options, and suggestions — no dynamic generators are needed.

Testing

All completions verified in a local Warp build with cargo run --features fast_dev:

1. Short flag completions (tree - + Tab) — shows -A, -a, -C, -c, -D, -d, etc.
2. Long flag completions (tree -- + Tab) — shows --charset, --device, --dirsfirst, --du, --fflinks, --filelimit, etc.
3. Sort suggestions (tree --sort + Tab) — shows ctime, mtime, name, size, version

All presubmit checks pass (prettier formatting, cargo fmt, cargo clippy, cargo test — 54+10 tests).

---

Conversation: https://staging.warp.dev/conversation/4f071408-ca9b-4182-9bcf-0c13e4c2d8f4
Run: https://oz.staging.warp.dev/runs/019d744d-205e-7e8a-b2ab-5c0827c29ba5
This PR was generated with Oz.

[linear]

APP-3957 [Auto] Add tree completions

Add command completions for tree, a recursive directory listing utility.

Fish shell reference implementation: https://github.com/fish-shell/fish-shell/blob/master/share/completions/tree.fish

[lucieleblanc]

Completion Screenshots

Screenshots taken during local testing with cargo run --features fast_dev:

Note: Screenshots were captured during testing but could not be uploaded via the sandbox environment. The three tests performed were:

1. tree - + Tab → dropdown showing short flags (-A, -a, -C, -c, -D, -d, etc.)
2. tree -- + Tab → dropdown showing long flags (--charset, --device, --dirsfirst, --du, --fflinks, --filelimit, etc.)
3. tree --sort + Tab → dropdown showing sort suggestions (ctime, mtime, name, size, version)

All completions were verified working correctly in the Warp completion dropdown menu.