COR-1858: make CLI mutations visible in Console rail

[ape-rture]

Summary

• add scoped, expiring active Console session files refreshed by agent watch heartbeats
• add --console-session / INDEXING_CO_CONSOLE_SESSION_ID resolution while preserving legacy session inputs
• propagate resolved Console session IDs to Data Warehouse API requests via X-Session-Id
• warn when Console activity sync fails after a successful mutation
• make hint emit session-aware and report backfill activity

Verification

• npm run typecheck
• npm run lint
• npm test

Linear: COR-1858