Previous behavior: cbm_store_get_overlay_node_view_summary() materialized active_node_candidates and applied ROW_NUMBER ownership ranking for every read, even when overlay_generations contained no overlay_ready row. On the retained 15,664-node graph this added about 120 ms to search_graph, search_code, route, and other MCP reads.
Use the existing indexed cbm_store_count_overlay_generations() authority to gate the active view. When no ready generation exists, reuse cbm_store_count_nodes() for the exact canonical and total counts; projects with ready overlays retain the complete tombstone and ownership CTE.
Add an sqlite3_trace_v2 regression guard in tests/test_store_nodes.c that rejects active_node_candidates on the clean path while requiring the canonical count query. The same test continues to verify exact counts for successive ready overlays.
Verification: CBM_ONLY_TEST=overlay_node_view_summary make -f Makefile.cbm test-focused TEST_SUITES=store_nodes; ASan/UBSan store_nodes, mcp, and tool_consolidation suites; optimized self-dogfood MCP smoke with search_graph median reduced from 120.149 ms to 3.825 ms and search_code from 131.946 ms to 10.436 ms while the exact incremental gate passed.
Signed-off-by: Andrew Hundt <ATHundt@gmail.com>
Andrew Hundt
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