docs: update README with real-world benchmarks and v0.9.0 features

feat: wire auto-schema inference into pipeline

feat: auto-schema inference from sample text via LLM

feat: Ollama auto-detection with tiered LLM fallback

feat: TOML config, CloakPipe integration, GPT-4o-mini default

fix: resolve all clippy warnings for CI

chore: bump version to v0.8.0 for release

feat: tiered extraction pipeline with GLiREL + LLM fallback

fix: cargo fmt, make homebrew tap update

feat: add ctxgraph mcp start CLI subcommand,list_entities/export_graph MCP tools, GLiREL extraction

docs: add dev.to version of blog post with mermaid.ink image URLs

docs: add DX-first README, CONTRIBUTING guide, blog posts, issue templates

fix: use ubuntu-24.04 with native cross-gcc for aarch64 release

fix: eliminate openssl-sys from dependency tree for cross-compilation

fix: use cross for aarch64-linux release build, update README benchmarks