feat: rename lifecycle labels to unified status/ namespace

[castrojo]

Problem

Bonedigger's pipeline widget already shows the right vocabulary:

filed → approved → queued → claimed → done

But the actual labels it creates and enforces use 3 different namespaces:

• needs-triage (bare, no namespace)
• status/approved (status/)
• queue/agent-ready (queue/)
• queue/claimed (queue/)
• queue/hold (queue/)

Contributors cannot memorize a sequence that jumps namespaces — especially when it doesn't match the widget they're looking at.

Proposed rename

Unify all lifecycle labels under status/:

Current	Proposed	Color (keep)
needs-triage	status/triage	d4c5f9
status/discussing	status/discussing	no change
status/approved	status/approved	no change
queue/agent-ready	status/queued	a467dc
queue/claimed	status/claimed	e8b86d
queue/hold	status/hold	ffffff

Sorted alphabetically in GitHub's label list, all lifecycle labels group together as status/*.
Human memorization: triage → discussing → approved → queued → claimed. Matches the widget.

Also: clean up auto-created legacy labels

The ensure-labels job also auto-creates labels the factory wants to retire:

• kind:agent-donation (colon) → rename to flow/agent-donation
• hold (bare) → covered by status/hold above
• priority/critical, priority/high → factory uses priority/p0, priority/p1 instead; consider removing from auto-create or mapping the descriptions

Dependent changes in factory repos

Once bonedigger is updated, these need to follow:

• hive-progress-sync.yml in all factory repos hardcodes queue/agent-ready and queue/claimed — needs update to status/queued / status/claimed
• label-workflow.md and agentic-model.md in projectbluefin/common — docs update
• Old labels deleted after a migration window

Tracked in projectbluefin/common issue #508 (full migration table).

Notes

• agent/blocked stays as-is — it's an overlay flag, not a pipeline stage
• status/discussing stays as-is — already correct
• status/approved stays as-is — already correct
• The pipeline widget text (filed / approved / queued / claimed / done) doesn't need to change; the new label names align to it exactly