The korean-character-count feature guide drifted from the verified NEIS helper output, so this follow-up adds a docs regression that executes the live command and corrects the stale byte example in the feature doc.
Constraint: The skill promises deterministic exact counts in both docs and CLI output
Rejected: Hardcode a separate doc-only expected value in tests | would still allow the published example to drift from the helper
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: When docs publish exact count values, keep them pinned to live helper output rather than a copied constant
Tested: node --test scripts/skill-docs.test.js scripts/test_korean_character_count.js
Tested: node scripts/korean_character_count.js --text '가나다' --format json
Tested: node scripts/korean_character_count.js --file <tmpfile> --profile neis --format text
Tested: printf '한\r\n나' | node scripts/korean_character_count.js --stdin --format json
Tested: npm test
Tested: npm run ci
Not-tested: none
Issue #65 needs deterministic Korean character, line, and byte counting for self-intros and similar forms, so this adds a bundled helper plus skill/docs/tests around a fixed grapheme/UTF-8 contract with an explicit NEIS compatibility profile.
Constraint: Must avoid LLM estimation and keep results deterministic across repeated runs
Constraint: No new dependencies; rely on Node 18+ Intl.Segmenter and Buffer.byteLength
Rejected: Per-request ad hoc scripts only | contract drift would make repeated counts inconsistent
Rejected: Legacy encoding heuristics as the default | modern UTF-8 contract is safer unless the target explicitly says otherwise
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: Keep and profile semantics in sync with docs/tests before changing counting rules
Tested: node --test scripts/skill-docs.test.js scripts/test_korean_character_count.js; helper smoke via text/file/stdin; npm test; npm run ci; LSP diagnostics on changed JS files
Not-tested: Proprietary site-specific counters beyond the documented default/NEIS contracts
