Add codespell support with configuration and fixes

[yarikoptic]

Add codespell configuration and fix existing typos. AI is great, but old deterministic code has still its function! ;)

More about codespell: https://github.com/codespell-project/codespell

I personally introduced it to over a hundred projects already mostly with positive feedback (see "improveit-dashboard").

CI workflow has permissions set only to read so should be safe.

Changes

Configuration & Infrastructure

• .codespellrc with skip patterns for binary/data files and a curated ignore-words-list for domain-specific terms
• .github/workflows/codespell.yml runs codespell on push and pull_request to main (read-only permissions, pinned to commit SHA)

Skip patterns

*/secrets.rs — src/authorship/secrets.rs holds a hardcoded BIGRAMS table of 2-letter byte literals (b"te", b"nd", b"ue", ...) used to discriminate random strings from natural code; every entry trips codespell.

*/example-claude-code.jsonl, */windsurf-session-simple.jsonl — captured agent transcripts in tests/fixtures/ containing intentional typos (fake user input like "Eraase rewrite you cand o bettter") and truncated text used as test data.

Domain-specific whitelist

• caf — "café" rendered via Latin-1/UTF-8 escape sequences in tests (e.g. b"caf\xe9")
• ratatui — Rust TUI library (Cargo dependency)
• juxt — JS functional helper name (juxtapose) used in test fixtures
• ser — serde::ser module
• statics — test variable holding a src/static_files.rs filename handle
• nam — "Việt Nam" in test data for non-ASCII filenames
• vas — "VirtualAttributions" abbreviation used throughout authorship code
• fo — Windows tasklist /FO output-format flag
• ue — test variable holding a util_e.py filename handle
• afile — Vim autocmd built-in <afile> (current buffer file)

Typo fixes

Ambiguous (1 fix, manual)

• runing → running (AGENTS.md / symlinked CLAUDE.md, Taskfile.yml) — codespell suggested both running and ruining; context "approaches for runing git-ai locally" makes running clearly correct

Non-ambiguous (8 fixes via codespell -w)

• taht → that (AGENTS.md)
• foramt → format (docs/migrations/sessions-v2-note-format.md)
• writen → written (src/authorship/attribution_tracker.rs doc comment)
• regualar → regular (src/authorship/rebase_authorship.rs comment)
• Ammended → Amended (src/authorship/rebase_authorship.rs tracing::debug! log message)
• Persistance → Persistence ×2 (src/git/repo_storage.rs block comments)
• versino → version (tests/integration/git_cli_arg_parsing.rs test comment, already aligned with the live assertion)
• nonexistant → nonexistent (tests/integration/gix_config_tests.rs regex pattern in a _no_matches test where the pattern only needs to not match anything)

Non-ambiguous fixes were committed via datalad run 'codespell -w' so the command and outputs are recorded in the commit and re-runnable with datalad rerun.

Historical context

This project has had ~11 prior commits matching typo/spell in their subject (e.g. "Fix typo commiting->committing in stats", "Add errata for field name typo in v3.0.0"), so automated checking is well justified.

Testing

uvx codespell passes cleanly (exit 0) after all fixes.

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🤖 Generated with Claude Code and love to typos free code

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[CLAassistant]

All committers have signed the CLA.

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 2 additional findings.