fix: Claude Desktop (Cowork) marketplace sync — schema-clean Claude hook config

[Verteletsky]

Summary

Fix #582 — adding this repo as a marketplace in Claude Desktop (Cowork) fails with "Marketplace sync failed".

Root cause

Sync is validated server-side by Anthropic's marketplace service. It rejects the plugin because the hook config referenced by .claude-plugin/plugin.json uses the non-standard commandWindows field:

status: failed_content — "Unknown hook field(s) ['commandWindows'] in 'SessionStart' matcher 0 hook 0.
Hooks must only use fields the approval UI can display" (same for SubagentStart / UserPromptSubmit)

The $schema URL (#586's theory) is unrelated: the validator parses marketplace.json with $schema present without complaint and proceeds to plugin validation.

Change

• Add hooks/claude-hooks.json — a copy of the shared config minus commandWindows (schema-clean for the Claude validator).
• • Point .claude-plugin/plugin.json at it. .codex-plugin keeps hooks/claude-codex-hooks.json with commandWindows intact, so Codex/Windows behavior is unchanged.
• • Tests: manifest expectations updated, plus two regression tests — Claude config must never carry commandWindows, and it must stay a mirror of the shared config (guards against drift).
    Simply deleting commandWindows from the shared file was rejected as an option: it would drop the Windows-specific PowerShell guard for Codex hosts and break tests/hooks-windows.test.js.

Test plan

• node --test tests/*.test.js — 84/84 pass.
• • Verified end-to-end: a branch with this change syncs successfully in Claude Desktop "Add marketplace", and the plugin installs and activates (hooks fire on SessionStart).