Route MCP graph reads from hook workspace context

[ScriptedAlchemy]

Summary

• Adds connection-local hook workspace routing on the MCP server.
• Resolves hook cwd to the nearest registered project ancestor and injects that project selector into follow-up registered-project graph reader calls when the caller did not provide an explicit selector.
• Reuses the existing graph-reader dispatch policy and adds an integration test for a hook from one registered project routing tracedecay_files away from the active project.

Verification

• CARGO_TARGET_DIR=/home/zack/projects/tracedecay/target cargo test --features test-transport --test mcp_suite hook_event_workspace_context_routes_followup_graph_reads -- --nocapture
• CARGO_TARGET_DIR=/home/zack/projects/tracedecay/target cargo test --features test-transport --test mcp_suite mcp_handler_test::always_loaded_graph_tool_schemas_advertise_project_selectors
• git diff --check

Known unrelated failures

• CARGO_TARGET_DIR=/home/zack/projects/tracedecay/target cargo test --features test-transport --test mcp_suite mcp_server_test:: still has 2 failures unrelated to this change: test_tools_call_plain_text_failure_sets_is_error expects old changelog git failure text, and test_error_tracking expects status text to contain an errors field.

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