Pattern: The Codebase Graph Has Become the Standard Context-Reduction Layer for Coding Agents

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Two independent projects trending simultaneously converge on the same architecture: deterministic Tree-sitter parsing for structure, an LLM pass for semantics, and a persistent on-disk graph the agent queries instead of grepping. code-review-graph (27.2k stars) targets review and blast radius; Understand-Anything (76.5k stars) targets comprehension with dependency-ordered guided tours and diff impact analysis, auto-discovering via `.cursor-plugin/plugin.json` and `.copilot-plugin/plugin.json`. The shared insight is that structural extraction must be reproducible and the semantic layer disposable — you re-run the parser on every commit and only re-summarize what changed.