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feat: add bb_task creation primitive with pointer-keyed base registry (#720)

- new bb_task component: pure 2x2 xTaskCreate resolver (dynamic/static x
  plain/pinned-core), owning the unicore clamp and bytes->words conversion
  once instead of hand-rolled per call site
- pointer-keyed base registry (bb_registry_register_ptr) tracks every task
  created via bb_task_create(), tolerating re-invocation on the same handle
- pure mark-and-sweep evaluator (bb_task_base_sweep_apply) with a
  single-miss grace window, mirroring bb_health_stack's rationale; the
  periodic scan that drives it lands in a later PR
- dormant in this PR: no in-tree caller of bb_task_create() yet
- espidf shell linked (unused) from examples/smoke to prove it compiles
  under -Werror; host stub + 41 new host tests, 100% branch coverage on
  the pure resolver/base/sweep code


Claude-Session: https://claude.ai/code/session_01DcUrpp83FwvUE4kUrpgRh6

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

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