fix(opencode): rename .opencode/command/ → .opencode/commands/ to match OpenCode's discovery convention

[fcmfcm01]

Problem

OpenCode auto-discovers custom commands from .opencode/commands/ (plural), per the official docs:

You can also define commands using markdown files. Place them in:

• Global: ~/.config/opencode/commands/
• Per-project: .opencode/commands/

Ponytail shipped them in .opencode/command/ (singular), so the slash commands (/ponytail, /ponytail-audit, /ponytail-review, /ponytail-debt, /ponytail-help) were never auto-loaded by OpenCode. The plugin's experimental.chat.system.transform hook correctly injected the ruleset and persisted /ponytail mode switches, but typing any of those commands in the TUI produced no completion and no execution — the entire string was passed through as a user message.

The README's claim that the plugin "adds the /ponytail commands" was effectively false for everyone except someone running OpenCode from inside this repo's checkout (and even then, only by accident of the plugin-relative path).

Fix

Rename the directory to match OpenCode's convention:

• git mv .opencode/command .opencode/commands (rename detected by git, file history preserved at 100% similarity)
• tests/commands.test.js: path assertion updated to .opencode/commands/
• docs/agent-portability.md: OpenCode row updated to .opencode/commands/
• README.md: add a paragraph in the OpenCode install section documenting how to use the commands globally across projects (symlink into ~/.config/opencode/commands/), since the plugin path only auto-discovers commands when running OpenCode from this repo's root

Verification

$ npm test
# tests 51
# pass 50
# fail 1   ← pre-existing: `csv: correct pandas one-liner passes`, unrelated (pandas not installed locally)

The 5 commands tests in tests/commands.test.js all pass after the path update. The single failure is a pre-existing CSV benchmark env issue (same # fail 1 on main without my changes).

Notes

• The directory name was singular by ponytail's own convention (hooks/, skills/, command/ — all singular), but OpenCode's spec requires plural commands/. Aligning to the spec is the smaller change than asking OpenCode to accept both forms.
• Cross-project global install is now a one-liner documented in README:

mkdir -p ~/.config/opencode/commands
ln -s "$PWD"/.opencode/commands/*.md ~/.config/opencode/commands/

Run once from the repo root; rerun if a new command is added; restart OpenCode.

[slamp]

$PWD extends to where you run it, not to the root of the repository, it's easy to miss it even if it's written a few lines above. Instead, in the README we could write:

mkdir -p ~/.config/opencode/commands
ln -sf /path/to/ponytail/.opencode/commands/*.md ~/.config/opencode/commands/

I added the -f , because rerunning fails with "File exists" on existing symlinks

/cc @fcmfcm01

[slamp]

And thanks for the patch! it works in my install