Govern task context and advance execution pointer

docs/status/M15-02F.md

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+# M15-02F Status
+
+status: done
+task: Unknown-data preservation fail-closed audit
+updated: 2026-08-19 America/New_York
+enablingTask: false
+parityStateChange: false
+
+`npm --prefix web run test:blender-unknown-data-audit` passed: applicable 0, blocked 0, notApplicable
+6,900. No unknown-data save/reload preservation claim exists in the inventory-only map.
+
+Artifacts: audit `bec8d2444ceaeae3db9d35ce6621129c90df2f15bf950667be6e85b096a72e4f`, report
+`e2733f49fa9bd755164519ca9dd46a99b1f41036b8ae4bdb0552487dcec4ab7a`, manifest
+`ec3fa17832e5fe335b11bd6c12e873abfd4b19273d8e110de860f04b55e7a7e6`.
+
+Next: `M15-03A`.