Net-new SDK surface since 0.4.0:

- `bcli pack` — installable bundles (queries + batches + agent
  fragments + endpoint presets) with a JSON ledger, per-fragment
  AGENTS.md/CLAUDE.md `targets`, registry-preset conflict
  detection. Two built-in packs (`starter-generic`, `cronus-demo`).
- `bcli ask` — oracle-style one-shot LLM second opinion. Claude
  and OpenAI backends mirroring the `extract` factory. New
  `bcli.ask.context_providers` entry-point group for downstream
  domain glossaries.
- `bcli.context` — typed `ContextBundle`, 3-layer redaction
  (audit keys + telemetry patterns + URL/GUID/attachment scrub),
  last-error capture (no tracebacks by default), opt-in http-tail.
  Shared substrate for `bcli ask` and the future `bcli agent`.
- `bcli-site/` — Astro + Tailwind v0 landing-page scaffold for
  bcli.sh.

See CHANGELOG.md for the full set.