Auto: Content & Presence Updates (June-July 2026)

[ppradyoth]

Cumulative content & presence work for the June–July 2026 autonomous agent window. Do not merge until review.

Cumulative changelog

2026-06-30 run

• New script: code-fence-lint.js — zero-dependency Node CLI that lints fenced code blocks in Markdown. Detects unclosed fences (a fence that opens but never closes — error), missing language tags (opening fence with no info string — warning by default; --strict-language promotes to error, --no-require-language silences), and mismatched fence lengths (a closer shorter than its opener doesn't close the block). CommonMark-aligned and length/character-aware: a closer must use the same char (``` or ~~~) and be at least as long as the opener, so backtick-wrapped blocks containing ~~~ (and vice-versa) parse correctly; only a line starting (after ≤3 spaces) with a fence run counts, so inline code never false-positives. --json, --quiet, CI exit codes (0 ok / 1 lint fail / 2 usage), exports matchFence/lintFences for require(). Honest documented limitation: not a full block parser (deeply nested/blockquoted fences). Tested before commit: unclosed + missing-lang fixture → exit 1; clean file (list-item fences, backtick-nested, cross-char) → exit 0; mismatch fixture → flagged; every CLI flag and error path; the repo's own README → clean. README section 9 + TOC entry added.

2026-06-29 run

• New script: table-fmt.js — gofmt for GFM tables. Pads each column to its widest cell, rewrites the delimiter row to honor alignment (:---/---:/:--:/---), justifies body cells, repairs ragged rows, leaves tables inside fenced code blocks untouched. Idempotent, stdin (-), --write/--check/--json, CI exit codes. Tested across all column types, ragged-row repair, fence skipping, escaped pipes, idempotency, every CLI/error path. README section 8 + TOC entry.

2026-06-28 run

• New script: heading-lint.js — zero-dep linter for Markdown heading structure (duplicate-slug, skipped-level, multiple-h1/no-h1, empty-heading, first-not-h1). Reuses the GitHub slug algorithm and code-fence skipping. --json, --quiet, CI exit codes. README section 7 + TOC entry.

2026-06-27 run

• New script: frontmatter-lint.js — zero-dep linter for YAML frontmatter (required keys, date validity, boolean/list types, duplicate keys, unterminated blocks). --dir recursion, --json, CI exit codes.

2026-06-26 run

• New examples/ folder — check-docs.sh, docs-check.yml (GitHub Actions), git-pre-commit hook wiring the docs scripts into automation.

2026-06-25 run

• New script: link-check.js — zero-dep Markdown link checker (dead relative links + #anchor validation with GitHub's real slug algorithm).

2026-06-23 run

• New script: markdown-toc.js — zero-dep, GitHub-accurate TOC generator. Code-fence aware, idempotent --write, CI-friendly --check.

Verification

• All scripts run locally and tested before commit; zero runtime dependencies (pure Node built-ins).
• code-fence-lint.js validated on crafted fixtures (unclosed, missing-language, mismatched, cross-char nesting) + every CLI path; runs clean against the repo's own README.

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