v0.3.0

What's Changed

• C0 — rename Lex-Bot → Cairn (code) by @AZANIR in #28
• docs: README launch badges (CI/npm/node/license) → @plune-ai/cairn by @AZANIR in #29
• fix: cairn --version reads from package.json (was stale 0.1.0) by @AZANIR in #30
• docs: demo asciicast + generator; fix broken README badge by @AZANIR in #31
• L1-01 — per-role model routing (worker/reasoner) + per-run cost/tokens by @AZANIR in #32
• L1-05 — first-class cairn session capture + missing/expired session UX by @AZANIR in #33
• L1-02 — Groq provider + one-flag fast routing preset by @AZANIR in #34
• L1-03 — reproducible cost benchmark (default/volume/fast) in README by @AZANIR in #35
• fix(llm): Groq fast preset — structured output via tool-calling (was 400 json_schema) by @AZANIR in #36
• L1-04 — explore hardening: error handling · repair convergence · budget surfacing · first-run UX by @AZANIR in #37
• automate: validate⇄repair⇄keep-best so design→automate matches explore quality (#40) by @AZANIR in #41
• explore: emit ATC/MTC case docs + surface the design→automate review flow (#39) by @AZANIR in #42
• chore: release 0.3.0 by @AZANIR in #43

Full Changelog: v0.2.1...v0.3.0