feat: support experimental WebMCP client.reportProgress and ensure de… - #3

Description

This Pull Request implements support for WebMCP's experimental client-side progress reporting feature and fixes delegation tool registration to ensure they are always discoverable by external browser agents.

🚀 Key Changes

1. WebMCP client.reportProgress Integration (src/lib/WebMCPTools.ts):

   • Updated the execute function signature for registered WebMCP tools to support an optional second parameter: client?: { reportProgress?: (message: string) => void }.
   • Updated the tool runtime's ToolContext.onEvent to automatically stream raw, structured AgentEvent objects directly as a serialized string using JSON.stringify(event) to client.reportProgress.
   • Handled filtering to exclude completion done events (since the final payload is returned via the execution result).

2. Unconditional Delegation Tool Discovery (src/context/MCPProvider.tsx):

   • Removed the restrictive if (!factory) return; check that was preventing delegation tools (delegate_to_skill, invoke_agent, invoke_planner, invoke_researcher, invoke_writer, invoke_reviewer) from being registered when no local Gemini API key was present on initial mount.
   • Switched to utilizing the stable fallback runner factory (workspaceCtx.factory) so that delegation tools are always advertised to and discoverable by external agents driving the workspace.

3. Robust Test Environment Setup (src/test/setup.ts):

   • Appended a complete and standard mock for localStorage in the JSDOM Vitest environment, resolving TypeError: localStorage.clear is not a function errors and restoring the entire test suite baseline to 100% health.

🧪 Verification

• Added Integration Test (src/lib/WebMCPTools.test.ts): Added a test verifying that progress callbacks (client.reportProgress) are correctly called with JSON-serialized AgentEvent strings representing the intermediate thinking steps and text deltas.
• Green Test Suite: Verified that all 255 unit and integration tests are passing successfully.
• Linting and Formatting: Confirmed that code is completely lint-free and Prettier formatted.