v0.3.0-beta.1

Second beta on the 0.3.0 line. Consume via
npx github:databricks-solutions/lakebase-app-dev-kit#v0.3.0-beta.1.

Added

• Promote phase. After a feature is accepted, the deterministic driver runs a
  PR cycle (prepare-pr -> wait-ci -> HITL promote gate) then merges the feature up
  to its parent tier in git + Lakebase, so the next sprint forks from a populated
  parent.
• Universal turn recorder. LAKEBASE_TDD_RECORD_DIR makes the driver record
  every state-machine turn (design, build, gates, deploy, promote) as a replayable
  per-turn corpus: turns/<NNNN>-<label>/ (manifest + the .tdd/code delta that
  turn produced) + turns/index.json, plus the cumulative recorded-artifacts
  and recorded-build mirrors the existing replay engine consumes.
• imports-clean gate (lakebase-tdd-imports-clean): the app entry must import
  without an optional build artifact (e.g. client/dist) present, catching
  import-time coupling before deploy. New import-time-build-coupling bad smell
  plus a dev/prod-parity rule in the software-design-principles canon.
• Claude Code plugin. The kit installs as a plugin: claude plugin marketplace add databricks-solutions/lakebase-app-dev-kit then claude plugin install lakebase-app-dev-kit@lakebase-app-dev-kit. Launch the workflow with
  /lakebase-app-dev-kit:tdd (resumes in a scaffolded project, guides creation
  elsewhere).
• Per-role agent runtime. Eight role agents (product-owner, spec-author,
  ux-designer, architect-reviewer, test-strategist, navigator, driver,
  release-engineer) scaffolded into a project's .claude/agents/ and invoked by
  the driver as claude --agent <role>.
• Per-story pipeline + experiments. Stories stream through design -> build
  with a ready queue; each story builds on its own experiment branch
  (cut / accept=merge / discard), paired with a Lakebase branch.
• Deterministic deploy + Release Engineer handoff at story acceptance, with
  deploy-evidence as the backstop; honest GREEN (no GREEN without a passing
  runner outcome) + escalate-to-HIL on any agent-surfaced error.

Changed

• Build commits working software at each GREEN + REFACTOR (code only, on the
  experiment branch), so accept's merge carries real commits to the feature branch
  and the promote phase opens a clean PR. CI now builds the client before tests
  (dev/CI parity).
• Agent-loop performance (P0-P7). Per-turn timing report
  (lakebase-tdd-timing), a leaner pre-digested REVIEW rubric, a fresh-per-story
  build session, a low-effort REVIEW turn, and reduced inter-phase shell overhead.
• Kit CLIs resolve through a project's scripts/lk (ref-keyed cache or
  LAKEBASE_KIT_DIR) instead of per-call npx git resolution.
• The orchestrator is a deterministic state-machine driver
  (lakebase-tdd-drive), not an LLM agent.