dangernoodle-io / breadboard / 29168555582

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feat: add bb_config_staged staged-write primitive (#820)

- generic staged multi-field write over bb_config, atomic all-or-nothing
  commit via bb_storage's txn group (PR1b of the bb_nv creds-cluster)
- 3-verb API: begin/set_{bool,u8,u16,u32,i32,str,blob}/commit/discard,
  wrapping bb_storage_txn_t and reusing bb_config's own scalar/str/blob
  encode path byte-for-byte
- layered sticky-error model: a local precheck failure (type mismatch,
  cross-namespace field, oversize str/blob) never reaches the txn and
  aborts it on commit; a delegated txn-level failure (e.g. oversize
  value) is left to the txn's own sticky error
- host tests against the real ram backend cover the all-or-nothing
  contract, discard idempotency, and every precheck/delegated error path


Claude-Session: https://claude.ai/code/session_01VQXiyqFjcMpPPpef5TL9gA

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

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