docs(changelog): add 0.3.0 entry — offline-first run + classify command

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: stackbilt-admin

CHANGELOG.md

@@ -4,6 +4,21 @@ All notable changes to this project are documented in this file.
 
 The format is based on Keep a Changelog and follows Semantic Versioning.
 
+## [0.3.0] - 2026-06-12
+
+### Changed
+- **`stackbilt run` is now offline-first** — `buildScaffold()` from `@stackbilt/scaffold-core` is the default path; zero network, zero credentials required. Pass `--gateway` to opt into the Stackbilt gateway for cloud classification.
+- `--persist` flag: POST the scaffold to the platform (`/api/flows`) to save it to the user's account.
+- `--oracle` flag (requires `--persist`): request LLM polish on the persisted scaffold.
+- Removed implicit gateway routing from API key presence — gateway is now always explicit opt-in.
+
+### Added
+- **`stackbilt classify <description>`** — zero-cost intent classification using the local scaffold-core engine. Prints pattern, confidence, traits, and tier-2 recommendation to stdout. No API key required.
+- `localScaffoldToResult()` adapter — maps `LocalScaffoldResult` → `ScaffoldResult` with canonical role normalization (`entry→scaffold`, `adf→governance`, `readme→doc`).
+- `.gitignore` — `node_modules/`, `dist/`, `*.tsbuildinfo`, `.charter/`.
+
+Closes stackbilt-build#4 (offline-first run), stackbilt-build#3 (classify command)
+
 ## [0.1.0] - 2026-05-23
 
 Initial release — commercial surface extracted from `@stackbilt/cli` per [RFC #112](https://github.com/Stackbilt-dev/charter/issues/112).