added skip permission from main sdk to port

[tilakpatell]

The official Python and TypeScript SDKs support skip_permission and overrides_built_in_tool on tool definitions (Python docs), but the C++ port doesn't include them yet. This PR adds parity for both.

Changes

• include/copilot/types.hpp — Added skip_permission and overrides_built_in_tool bool fields to struct Tool (default false), plus ref-qualified fluent setters for chaining
• src/client.cpp — build_session_create_request and build_session_resume_request now include skipPermission and overridesBuiltInTool in the JSON-RPC tool payload when true

Usage

auto lookup = copilot::make_tool("safe_lookup", "Read-only lookup",
    [](std::string query) { return do_lookup(query); },
    {"query"}
).with_skip_permission();

auto editor = copilot::ToolBuilder("edit_file", "Custom editor")
    .param<std::string>("path", "File path")
    .handler([](std::string path) { /* ... */ })
    .with_overrides_built_in_tool();

Fully backward compatible — both fields default to false, no existing code affected.

[0xeb]

Thanks for the contribution @tilakpatell! Great catch on the missing parity for skip_permission and overrides_built_in_tool.

The core functionality (fields + wire serialization) was independently added as part of a broader v0.1.49 parity sync, but your PR identified the missing fluent setters (with_skip_permission() / with_overrides_built_in_tool()), which are a nice ergonomic improvement.

I've incorporated the fluent setter pattern from your PR in commit 7dc023d with a Co-authored-by credit. Thanks for contributing!

[0xeb]

Closing as the changes have been incorporated (see comment above). Thanks again!