docs: add CHANGELOG for v0.9.0–0.9.5

Author: 1bcMax

CHANGELOG.md

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+# Changelog
+
+## 0.9.5 (2026-03-25)
+
+### Bug Fixes
+
+- **Fallback 400 errors**: Removed virtual routing profiles (`blockrun/auto`, `blockrun/eco`) from fallback chain — backend doesn't recognize these, causing 400 loops. Fallback now uses concrete models: `deepseek/deepseek-chat` → `google/gemini-2.5-flash` → `nvidia/nemotron-ultra-253b`
+- **Safety filter**: `buildFallbackChain()` now strips routing profiles to prevent them from ever reaching the backend
+- **`brcc start` automation**: Smarter claude binary detection — searches PATH + common install locations (`~/.local/bin`, `/usr/local/bin`). Falls back to printing manual env vars instead of crashing
+
+### Docs
+
+- Use `blockrun.ai/brcc-install` short URL in README install command
+
+## 0.9.4 (2026-03-24)
+
+### Bug Fixes
+
+- Override native Anthropic model IDs (e.g. `claude-sonnet-4-6-20250514`) while respecting BlockRun model IDs that contain `/`
+- Skip npm publish in CI if version already exists
+
+### Docs
+
+- Updated README for v0.9.3 — 50+ models, new shortcuts, nemotron default
+
+## 0.9.3 (2026-03-24)
+
+### Features
+
+- Expand model catalog to 50+ models with updated routing and pricing
+- New in-session shortcuts: `use grok-4`, `use codex`, `use kimi`, `use devstral`, `use qwen-coder`, and more
+
+## 0.9.2 (2026-03-23)
+
+### Bug Fixes
+
+- Wrap backend errors in Anthropic format to prevent Claude Code from showing login page
+- Streaming memory cap (5MB) to prevent OOM on long sessions
+- Complete model pricing table for accurate cost tracking
+- Improve error messages and show debug log path
+
+## 0.9.1 (2026-03-22)
+
+### Features
+
+- Built-in smart routing from ClawRouter — 15-dimension classifier for automatic model selection
+- Default to `blockrun/auto` with 4 routing profiles: auto, eco, premium, free
+- In-session model switching — type `use gpt` or `use deepseek` inside Claude Code
+- Automatic fallback chain when models fail (429, 5xx)
+- Usage statistics with `brcc stats`
+- User-Agent and version headers on backend requests
+
+### Bug Fixes
+
+- Adaptive max_tokens: `max(lastOutput*2, 4096)` prevents token starvation
+- Debug logs to file (`~/.blockrun/brcc-debug.log`) instead of stderr
+- Always inject max_tokens default to prevent 400 on Turn 2+
+- Fix version mismatch, token parsing, port validation
+
+## 0.9.0 (2026-03-20)
+
+### Features
+
+- Initial release
+- Local proxy for Claude Code → BlockRun API
+- Dual chain support (Base + Solana)
+- x402 micropayment signing
+- `brcc setup`, `brcc start`, `brcc models`, `brcc balance` commands
+- 40+ model support with `--model` flag
+- Install script for one-line setup