Problem
The backlog workflow only allows forward transitions in most cases. Practical scenarios require backward transitions:
`accepted → proposed` — demote an item back to backlog (e.g., external blocker discovered after acceptance)
`accepted → deferred` — defer an accepted item that can't proceed
`in_progress → accepted` — unclaim/abandon work without submitting for reviewCurrently the only way to handle situations like an externally-blocked accepted item is to add notes to the entry body, since the workflow won't allow moving it back.
Impacted Files
`extensions/software-kb/src/pyrite_software_kb/workflows.py` — add transitions to `BACKLOG_WORKFLOW`
`extensions/software-kb/tests/test_software_kb.py` — add test coverage for new transitionsAcceptance Criteria
`accepted → proposed` transition exists (requires reason)
`accepted → deferred` transition exists
`in_progress → accepted` transition exists (requires reason, clears assignee)
All new transitions require `write` permission
Backward transitions that lose work context require a reason
Existing tests still pass
New transitions have test coverage