feat(lastcode): support Action Resume with Claude

[lastobelus]

Claude threads could connect to LastCode’s MCP server, but Action Resume was restricted to Codex and Claude rejected the no-argument action-list schema.

This enables Claude as a supported Action Resume provider, publishes a Claude-compatible object schema for action listing, and gives Claude a small routing hint so natural prompts naming a saved Project Action use the product-native tools. OpenCode remains unsupported.

Validation:

• 83 focused Action Resume, MCP, and Claude adapter tests
• server typecheck and scoped lint/format
• LastCode quick CI on exact head (2699 tests passed; 7 skipped)
• manual macOS desktop QA: Claude listed and launched the saved action, showed Waiting, received exactly one automated follow-up, and reported secret marmalade with exit code 0

Refs #33

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