refactor: move tool bridge contracts to runtime owners

[limityan]

Summary

• Move MCP dynamic tool bridge naming, descriptor, validation, presentation, dynamic metadata, and ToolResult shaping into bitfun-agent-tools.
• Keep MCP transport, protocol result-content rendering, and connection lifecycle in services-integrations; keep core as the Tool trait adapter and connection caller.
• Move ACP external-agent tool naming, schema, validation, presentation, and ToolResult shaping into bitfun-agent-tools while keeping ACP config, client lifecycle, permissions, and protocol behavior in bitfun-acp.
• Update boundary guards and local module guidance so this PR does not introduce premature extension descriptor/provider APIs.

Validation

• pnpm run fmt:rs
• cargo test -p bitfun-runtime-ports
• cargo test -p bitfun-agent-tools
• cargo test -p bitfun-acp --lib
• cargo test -p bitfun-services-integrations --features mcp --test mcp_contracts mcp_dynamic_tool
• node scripts/check-core-boundaries.mjs
• node --test scripts/check-core-boundaries.test.mjs
• pnpm run check:repo-hygiene
• cargo check -p bitfun-core --no-default-features
• cargo check -p bitfun-core --features product-full
• cargo metadata --no-deps --format-version 1
• cargo check --workspace
• git diff --check

Note: Rust checks report existing rmcp deprecated enable_roots / enable_sampling warnings in services-integrations.