[AI-815] Surface --cursor/--copilot in kcap --help Plugin section

[realtonyyoung]

Problem

kcap --help (top-level usage) listed only [--codex] under Plugin, so a user reading the main help couldn't discover plugin install --copilot or --cursor — even though both have shipped (AI-731 Cursor, AI-815 Copilot) and kcap plugin --help documents them in full. Reported from the field: "looked at kcap --help and didn't see anything for Copilot."

The import line and the Hooks section already enumerate all four vendors; only this Plugin two-liner was stale.

Fix

Bring the Plugin summary in sync with PluginCommand's actual dispatch (--codex|--cursor|--copilot|--skills):

Plugin:
  plugin install [--project] [--codex|--cursor|--copilot|--skills]   Register hooks/skills (Claude default; flag picks the vendor)
  plugin remove  [--project] [--codex|--cursor|--copilot|--skills]   Remove hooks/skills (Claude default; flag picks the vendor)

Docs-only (embedded help resource). Verified by running kcap --help from a release build off current main.

🤖 Generated with Claude Code

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[realtonyyoung]

One consistency issue to fix before merging: this updates the top-level kcap --help Plugin summary to include --copilot, but the fallback usage emitted by PluginCommand.PrintUsage() still says Usage: kcap plugin <install|remove> [--project] [--codex|--cursor|--skills] [--if-installed]. So users who run an invalid kcap plugin ... command still get the stale target list, which undercuts the discoverability fix. Can we update that usage string to include --copilot as well?

[realtonyyoung]

Fixed in 3642781 — PluginCommand.PrintUsage() now emits [--codex|--cursor|--copilot|--skills], matching the top-level help and the actual dispatch. Verified by running kcap plugin <bad-args> from a release build; AOT publish clean (0 IL warnings).

[realtonyyoung]

One remaining docs consistency nit while this PR is already updating vendor discoverability: README.md still has the uninstall guidance saying kcap plugin remove [--codex|--cursor|--skills] for per-agent selective cleanup. Since plugin remove --copilot is now supported and this PR updates both top-level and fallback plugin usage to include it, can we add --copilot there too (or intentionally leave the README for a separate docs pass)?

[realtonyyoung]

Both review nits addressed:

• PluginCommand.PrintUsage() fallback now includes --copilot (3642781).
• README uninstall per-agent cleanup line now lists --copilot (1f115be).

So the vendor list is consistent across the top-level help, the plugin fallback usage, and the README.

[realtonyyoung]

Re-reviewed the latest revision. The prior consistency gaps are addressed: top-level help, PluginCommand.PrintUsage(), and the README per-agent cleanup line all now include --copilot. I do not have any further findings from source/diff inspection. Per request, I did not run tests.