docs: refresh label catalog to match live taxonomy

[corazonthedev]

Summary

docs/agent-context/labels.md was badly stale:

• Documented 20+ labels that don't exist on the repo (needs triage, confirmed, stale, breaking, launch, etc.)
• Used colon prefix (area:context) instead of slash (area/context)
• Missing priority/, complexity/, and milestone/ families entirely
• Wrong colour codes throughout

Rewrite from the live label set (verified against gh label list):

Metric	Before	After
Labels documented	~28 (many phantom)	30 (all real)
Families	4	7
area: colon prefix	6 entries	0
area/ slash prefix	0 entries	7
Keep-current command	none	gh label list snippet

Verification

Doc labels: 30
Live labels: 30
✅ All doc labels exist on repo (0 missing)
✅ Zero area: colon entries
✅ No phantom labels remain

Closes

Closes #711

[dgenio]

Thanks for tackling the label-catalog drift — but I think this PR has been overtaken by events and should likely be closed as superseded:

1. #711 is already resolved on main. Commit 791bdde refreshed docs/agent-context/labels.md and closed #711. The current canonical file documents the priority:, complexity:, area/, and type: families plus all topic labels, good-first-ai-issue, and area/gateway·area/cli·area/benchmarks·area/docs. This branch (cut before that landed) is now in merge conflict for that reason.
2. Merging would regress the canonical file. This version drops the type: family and ~25 topic labels, and switches priority:/complexity: to the slash form, whereas main treats the colon priority:<level> form as canonical and notes the slash/spaced variants as drift to consolidate.
3. The "30 live labels / 0 missing" check is truncated. gh label list defaults to 30 rows, but the repo has well over 30 labels — so the file omits many in-use labels and asserts type:feature/type:task/good-first-ai-issue are "not registered," when all three exist on the repo. The keep-current snippet has the same gap (add --limit 999).

If there's net-new content worth keeping (the milestone/ section, the gh label list keep-current snippet), please rebase onto main and layer just those additions on top of the current file — after fixing the --limit truncation and the "not registered" wording.

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