Add an AGENTS.md file

AGENTS.md

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+# AGENTS.md
+
+## Project Structure
+
+This repository is mainly a curated notes collection.
+Currently, main content lives in:
+
+- `hassan/`: Geolog- and logic-related notes.
+- `hqew/`: cleaned notes on query engines and related architecture topics.
+- `scratches/`: working drafts, diagrams, and exploratory material.
+- `tmp/`: local source material and downloads. It is ignored by Git and should not be referenced from durable notes.
+
+Root configuration is minimal: `pyproject.toml` defines a lightweight Python environment, `.editorconfig` sets formatting defaults, and `.gitignore`
+excludes local artifacts.
+
+## Writing Style
+
+- Use Oxford commas in inline lists: "a, b, and c" not "a, b, c".
+- Do not use em dashes. Restructure the sentence, or use a colon or semicolon instead.
+- Avoid colorful adjectives and adverbs. Write "TCP proxy" not "lightweight TCP proxy", "scoring components" not "transparent scoring components".
+- Use noun phrases for checklist items, not imperative verbs. Write "redundant index detection" not "detect redundant indexes".
+- Headings in Markdown files must be in the title case: "Build from Source" not "Build from source". Minor words (a, an, the, and, but, or, for, in,
+  on, at, to, by, of) stay lowercase unless they are the first word.