Add MCP tool handler support to the hooks engine - #38705
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## What changed - Discover synchronous `mcp_tool` hook handlers and invoke their configured MCP server and tool through a supplied executor. - Expand nested hook-event placeholders in MCP tool inputs while preserving JSON types, and process tool output through the existing hook output contract. - Represent hook details as handler-specific metadata in `hooks/list`, including MCP server and tool fields, and show those details in the TUI hooks browser. - Skip unsupported `SessionEnd` MCP hooks and runtimes without MCP invocation support with startup warnings. ## Testing - Cover argument expansion, missing placeholders, MCP invocation and hook decisions, discovery warnings, `hooks/list` metadata, and TUI rendering. GitOrigin-RevId: 295b845471fe92bd7ad7cd272fbcd2c3713912e0
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Add MCP tool handler support to the hooks engine
What changed
mcp_toolhook handlers and invoke their configured MCP server and tool through a supplied executor.hooks/list, including MCP server and tool fields, and show those details in the TUI hooks browser.SessionEndMCP hooks and runtimes without MCP invocation support with startup warnings.Testing
hooks/listmetadata, and TUI rendering.