Accelerate Connection Summary Projection

1. Runtime Projection

• Add connection-aware run summary matching for browser profile keys and explicit connection ids.
• Surface browser-surface failure reason evidence for surface_failed summaries.
• Reuse connector run pages per connector/status within one summary projection.
• Add a short-lived Postgres single-flight cache for repeated full-list reads.
• Preload retained-size stream/connection projection rows once for the full-list path.
• Add a committed real-browser performance harness with RSC fetch timing and RS/API probes.
• Keep the full connector-summary list shallow for run summaries while retaining deep run summaries on scoped connection/detail reads.
• Add the Postgres source/run spine summary index to bootstrap/migration code.

2. Tests

• Add a sibling browser-run regression test for listConnectorSummaries().
• Run targeted connection-summary projection tests.
• Run affected spine/control-plane tests.
• Run reference and console type checks.
• Smoke the browser harness against a known-fast live route without true failed requests.

3. Live Verification

• Deploy in a live-stack window.
• Verify /_ref/connectors repeated-call latency before/after.
• Verify /dashboard/runs real-browser RSC fetch count/timing before/after.
• Verify /dashboard and /dashboard/runs cold browser document time after retained-size preloading.
• Verify /dashboard and /dashboard/runs cold browser document time after shallow-list projection.
• Verify Amazon/Chase row state no longer reflects sibling draft-shell run evidence.
• Verify scoped connection detail/diagnostics still exposes deep run evidence after shallow-list projection.