docs: v2.3 provider-lifecycle closeout (Phase 6)
BOOCODER.md gains a Provider lifecycle section (config file + schema,
gitignored-with-exception, the 24h PROVIDER_PROBE_TTL_MS refresh contract,
enable/disable via Settings → Providers, custom-ACP add, native boocode
always-on, the honest subset-refresh known limitation, deploy + smoke).
docs/DEFERRED-WORK.md §2 (cold-probe skip) marked ADDRESSED with the still-
deferred Tier-2 follow-ups listed. CHANGELOG gets the v2.5.13 batch-closeout
entry. Docs only — no code.
indifferentketchup
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