chore: bump version and changelog (v0.4.3)

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

CHANGELOG.md

@@ -1,5 +1,16 @@
 # Changelog
 
+## 0.4.3 — 2026-03-16
+
+- **Every question is now crystal clear, every time.** You used to need 3+ sessions running before gstack would give you full context and plain English explanations. Now every question — even in a single session — tells you the project, branch, and what's happening, explained simply enough to understand mid-context-switch. No more "sorry, explain it to me more simply."
+- **Branch name is always correct.** gstack now detects your current branch at runtime instead of relying on the snapshot from when the conversation started. Switch branches mid-session? gstack keeps up.
+
+### For contributors
+
+- Merged ELI16 rules into base AskUserQuestion format — one format instead of two, no `_SESSIONS >= 3` conditional.
+- Added `_BRANCH` detection to preamble bash block (`git branch --show-current` with fallback).
+- Added regression guard tests for branch detection and simplification rules.
+
 ## 0.4.2 — 2026-03-16
 
 - **`$B js "await fetch(...)"` now just works.** Any `await` expression in `$B js` or `$B eval` is automatically wrapped in an async context. No more `SyntaxError: await is only valid in async functions`. Single-line eval files return values directly; multi-line files use explicit `return`.

VERSION

@@ -1 +1 @@
-0.4.2
+0.4.3