Skill commands appear in random order in the slash command picker

Description

In the desktop app (and TUI) slash command picker, skills are listed in a random/non-deterministic order instead of alphabetical order. The order changes between sessions because skill loading is fully concurrent.

Root cause

• command.list() in packages/opencode/src/command/index.ts returns Object.values(s.commands) with no sorting.
• Skills are appended to the commands map from skill.all(), which returns Object.values(s.skills) unsorted (packages/opencode/src/skill/index.ts).
• Skill frontmatter parsing happens with concurrency: "unbounded", so the insertion order (and therefore the displayed order) is nondeterministic.

Meanwhile the model-facing listing (Skill.available() / fmt()) already sorts alphabetically via toSorted((a, b) => a.name.localeCompare(b.name)), so the inconsistency is only in the UI path.

Reproduction

1. Run opencode desktop (or TUI) with multiple installed skills.
2. Type / to open the slash command picker.
3. Observe skill entries appear in arbitrary order, varying across restarts.

Expected behavior

Skills (ideally all commands) are listed in deterministic alphabetical order.

Suggested fix

Sort in command.list():

const list = Effect.fn("Command.list")(function* () {
  const s = yield* InstanceState.get(state)
  return Object.values(s.commands).toSorted((a, b) => a.name.localeCompare(b.name))
})

Environment

• opencode latest
• macOS desktop app