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Safety parity: propagate alloc_mem_size and decompose kfunc flags

- ringbuf_reserve now propagates allocation size into alloc_mem_offset=0
  and alloc_mem_size from the size argument register, enabling proper
  bounds checking on allocated memory (was havoc'd to unknown).
- Kfunc flag handling decomposed: accept acquire, destructive,
  trusted_args, sleepable (type-level safety covered); reject release
  (requires unimplemented lifecycle state machine).
- Parity docs updated: accurate implemented/unimplemented tracking for
  pointer type classes, helper families, kfunc flags, and lifetime gaps.
  Resource-tracking gaps clearly documented as intentionally deferred.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Elazar Gershuni <elazarg@gmail.com>

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