#1 Foundation Hygiene

[diptimoyghosh9593-pixel]

Milestone: Fix low-risk infrastructure debt before the V6 build starts.

Scope (do NOT touch migrations — owned by #2):

• Fix mockoon :3001 port conflict — mockoon/notion.json and mockoon/sarthi-demo.json both bind :3001; reassign sarthi-demo to :3010, keep :3001-:3004 clean for V6 connectors; update scripts/start-mockoon.sh health loop.
• Gate legacy V5.2 integrations (Stripe, Plaid, ERPNext, HubSpot, QuickBooks) out of the V6 worker path — comment-count gate, do NOT delete files (SAFE_DELETION_PROTOCOL).
• Add GET /v6/status in apps/core/internal/v6/handlers.go returning the frozen runtime inventory so the 501 list becomes a visible roadmap.

Definition of Done: mockoon starts all 4 V6 connectors on their ports with no conflicts; legacy integrations excluded from default worker path; /v6/status returns 200 with runtime inventory.

Tests required: existing mockoon smoke + a Go handler test for /v6/status (TDD).