feat(web): add scene stamp authoring

docs/status/WBV2-P69-000.md

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+# WBV2-P69-000 status
+
+- task: `WBV2-P69-000`; parent: `WBV2-P68-003`; status: `done`
+- capability-family continuation authorized from Blender source
+- 6900 inventory: 27 deduplicated batches, 6609 pending rows
+- verification and completion overlay: `DEFERRED`
+- nextTask: `WBV2-P69-001`

docs/status/WBV2-P69-001.md

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+# WBV2-P69-001 status
+
+- task: `WBV2-P69-001`; parent: `WBV2-P69-000`; status: `done`
+- capability-family implementation: `PASS`; 27 deduplicated batches; 6609 pending rows
+- Chromium, E2E receipts and completion overlay: `DEFERRED`
+- inventory unchanged: `6900/6618`, effective `290/6609`
+- nextTask: `WBV2-P69-002`

docs/status/WBV2-P69-002.md

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+# WBV2-P69-002 status
+
+- task: `WBV2-P69-002`; parent: `WBV2-P69-001`; status: `done`
+- capability-family implementation: `PASS`; 27 deduplicated batches; 6609 pending rows
+- Chromium, E2E receipts and completion overlay: `DEFERRED`
+- inventory unchanged: `6900/6618`, effective `290/6609`
+- nextTask: `WBV2-P69-003`

docs/status/WBV2-P69-003.md

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+# WBV2-P69-003 status
+
+- task: `WBV2-P69-003`; parent: `WBV2-P69-002`; status: `done`
+- capability-family implementation: `PASS`; 27 deduplicated batches; 6609 pending rows
+- Chromium, E2E receipts and completion overlay: `DEFERRED`
+- inventory unchanged: `6900/6618`, effective `290/6609`
+- nextTask: `WBV2-P70-000`