Add TODO.md

TODO.md

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+# Status
+
+1.0+
+
+Tagged 1.0.0 (2025-05-08). Substantial correctness fixes and features
+have landed since the tag.
+
+# Next Step
+
+Policy scaffold commit: add LICENSE, REPO_POLICIES.md, .editorconfig,
+.golangci.yml, and a comprehensive .gitignore (currently only the
+attrsum binary), and extend the Makefile (only test/build/clean/try
+today) with lint, fmt, fmt-check, check, and hooks targets. Fix the try
+target to use a temp fixture instead of the hardcoded
+$(HOME)/Documents/_SYSADMIN/cyberdyne path.
+
+# Completed Steps
+
+* 2026-02-02: correctness pass: track actual bytes read instead of
+    stale file size, atomic failure tracking in ProcessCheck, detect
+    file modification during checksum (TOCTOU), propagate countFiles
+    errors, single progress bar across paths, error on empty stdin,
+    dead code removal
+* 2026-02-01: added quiet mode, progress bar, summary report, and stdin
+    path input; multiple file/directory arguments for all commands
+* 2025-07-12: README update
+* 2025-05-08: initial working tool with passing tests, skips
+    non-regular files, Makefile, README; tagged 1.0.0
+
+# Future Steps
+
+* Add Dockerfile and .dockerignore that run make check, images pinned
+    by sha256, plus a Makefile docker target
+* Add .gitea/workflows/check.yml
+* Restructure README.md into the standard sections: Description,
+    Getting Started, Rationale, Design, TODO, License, Author (Getting
+    Started, Why?, TODO, License exist; Description, Design, Author are
+    missing)
+* Tag a patch release to ship the 2026-02-02 correctness fixes
+* Dry-run mode (--dry-run, -n): show what would be done without making
+    changes (from README TODO)
+* JSON output (--json) for scripting and integration (from README TODO)
+* Parallel processing (-j N) with multiple goroutines for faster
+    checksumming on large trees (from README TODO)
+* Formalize and document exit codes for scripting (from README TODO)