Add TODO.md

TODO.md

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+# Status
+
+pre-1.0
+
+# Next Step
+
+Bring the repo into policy compliance in one commit: add .gitignore,
+.dockerignore, .editorconfig, and .golangci.yml. Verify `make check` stays
+green with the new lint config.
+
+# Completed Steps
+
+- 2026-06-28: Fixed errcheck lint failures; added compilation smoke test;
+  tidied go.mod.
+- 2026-06-28: Added repo scaffolding: README, LICENSE, Makefile,
+  Dockerfile, REPO_POLICIES.md, and Gitea CI.
+- 2026-02-12: Fixed SQLite database locking by removing parallel
+  processing; fixed Linux build via golang.org/x/sys/unix Fadvise.
+- 2026-02-12: Optimized file copy for large databases; moved temp
+  directory to NVMe scratch storage.
+- 2026-02-11: Added date range support.
+- 2026-02-09: Initial implementation: single-day extraction, specific-date
+  targeting, faster pruning of throwaway database copies.
+
+# Future Steps
+
+- Add .gitignore, .dockerignore, .editorconfig, .golangci.yml (the Next
+  Step).
+- Expand tests beyond the compilation smoke test: unit tests for the
+  extraction, verification, and atomic-publish paths.
+- Cut a first SemVer release once compliance and test coverage land.