Initial commit

Photo-based book cataloger with AI identification.
Room → Cabinet → Shelf → Book hierarchy; FastAPI + SQLite backend;
vanilla JS SPA; OpenAI-compatible plugin system for boundary
detection, text recognition, and archive search.

AGENTS.md

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+# Agent Instructions
+
+**Read `docs/overview.md` once at the start of each session before doing anything else.**
+
+## Communication
+- Brief, technical only — no preambles, no summaries.
+
+## Implementation rules
+- No backward-compatibility shims or legacy endpoint aliases.
+- Run `poetry run presubmit` before finishing any task. Fix all failures before marking work done.