Bootstrap project and safe work-item workflow

delivery_backlog/stories/US07-03-media-hardening.md

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+# US07-03 — Harden Media and Metadata Edge Cases
+
+Epic: [E07](../E07-hardening-release.md)
+
+As a user, I want unusual or damaged media handled safely so one file cannot corrupt
+metadata, exhaust resources, or stop the library workflow.
+
+## Acceptance criteria
+
+- Supported format/orientation/profile combinations have bounded decode behavior.
+- Corrupt, truncated, huge-dimension, unsupported, and malformed-metadata files become
+  precise item errors without worker failure.
+- EXIF checkpoints preserve user fields and previous-stage fields, read back owned
+  fields, and mark conflicts divergent rather than silently repairing them.
+- Cache regeneration/invalidation and temporary-file cleanup are safe and scoped.
+
+## Automated tests
+
+- Extended golden corpus covers all declared format, orientation, corruption, and EXIF
+  cases with memory/time bounds and before/after metadata snapshots.
+
+## Dependencies
+
+- US07-01