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feat: bb_health_section composer registry (B1-1096 PR-1) (#963)

- new components/bb_health/include/bb_health_section.h + impl: composer-shaped
  section registry (bb_health_section_register/freeze) mirroring
  bb_diag_section.h's router but for a single composed document, over
  bb_registry (name-keyed table, first-wins on duplicate names, reject after
  freeze, reject snap_size > scratch cap)
- additive and inert: legacy bb_health_register_section() (bb_health.h) and
  the live /api/health handler are untouched; nothing consumes this registry
  yet
- BB_HEALTH_SECTION_TABLE_CAP=8 (matches BB_RESPONSE_MAX);
  BB_HEALTH_SECTION_SCRATCH_BYTES=128, justified against measured snapshot
  sizes (32B largest known today) and the httpd worker stack budget
  (6144B total, ~3.5KB WS-connect claim, ~768B flush buffer -- see
  bb_health_section_priv.h)
- host tests: reject-on-NULL, reject-on-duplicate-name, reject-after-freeze,
  capacity cap, snap_size-exceeds-scratch reject


Claude-Session: https://claude.ai/code/session_01FyQRchhnzygp3vMqmm7QWs

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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