fix: unify runner egress and AOP persistence

[M09Ic]

Summary

• route built-in tools through runner egress consistently
• make node/runtime AOP delivery single-source and idempotent by event ID
• persist continuation history by explicit inheritance/snapshot metadata instead of replaying full messages and tool results
• enforce one SQLite v1 schema and remove runtime legacy/compat migration paths
• avoid duplicate scan reports and remove the frontend IOA compat adapter

Validation

• 4 MiB continuation regression: inherited history is not re-emitted
• DeepSeek real request: 80 JSONL events, ~19.9 KiB, zero duplicate event IDs
• go test ./core/output ./pkg/web/service ./pkg/runner ./agent ./pkg/node -count=1

pm run build

• go test ./... -count=1 (all packages pass except existing environment-dependent ools/katana/TestE2EHeadlessReusesDiscoveredBrowser)

Note

• The branch is based on current master but intentionally removes the upstream JSONL/SQLite hard caps from the final diff; those caps silently discard events, contrary to the no-data-loss requirement. The fix is idempotent persistence and single-source emission.