feat(repo-standard): v0.1.0 - per-repo gate for the open/ standard

Five checks a single repository can answer on its own: README first
screen, install block, files required by its class, open/<name>
references, description length. Pure classifiers with I/O resolved into
their input, mirroring check-versions.mjs; ERROR/WARN/SKIP/OK, exit 1
on ERROR. 32 tests.

The reference check has THREE outcomes: "matches no repo" (ERROR) is
separate from "matches a known non-repo" (WARN). Sharing an outcome
would let real dead links hide inside correct text. Only names in URL
position count, and .git is normalised first - without that a raw scan
turns 3 dead names into ~20.

enabledPlugins is treated as a legitimate second install form; what the
gate requires in addition is a CLI command. The JSON form is never
reported as the defect.

STATE.md is gitignored from this first commit - public remote.
No hook yet: a blocking gate must first be precise enough not to fail a
correct repository.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WYJ3FHLtVgzFXMZ6UF598h

CHANGELOG.md

@@ -0,0 +1,44 @@
+# Changelog
+
+All notable changes to this project are documented here.
+Format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/);
+versioning is [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.1.0] — 2026-07-27
+
+First release. Covers the checks that a single repository can answer on its own.
+
+### Added
+
+- **The gate** (`scripts/repo-standard-check.mjs`) — pure classifiers with all
+  I/O resolved into their input, findings tagged `ERROR`/`WARN`/`SKIP`/`OK`,
+  exit 1 on `ERROR`. Five checks: README first screen, install block, files
+  required by the repo's class, `open/<name>` references, description length.
+- **Taxonomy register** (`register/repos.json`) — one central file mapping each
+  repository to its class, plus the per-class file and install requirements.
+  `--refresh` compares it against the live org listing.
+- **Three-outcome reference check** — "matches no repository" (`ERROR`) is a
+  separate finding from "matches something that is deliberately not a
+  repository" (`WARN`). Sharing an outcome would let real dead links hide among
+  correct text. Only names in URL position are treated as references; the `.git`
+  suffix is normalised first.
+- **The skill** (`skills/repo-standard/`) — the judgement the script cannot
+  encode: what a description should say, why the summary card must never be used
+  to verify one, what not to retrofit, and where the per-repo boundary is.
+- 32 tests over the pure classifiers, using the measured false positives as
+  reference fixtures.
+
+### Notes
+
+- Descriptions are measured in **codepoints** — not bytes, and not UTF-16 units.
+  The same string measures 248 / 249 / 253 across those three yardsticks when it
+  contains an astral character.
+- `enabledPlugins` in `settings.json` is treated as a legitimate second install
+  form. The gate requires a CLI command *as well*, and never reports the JSON
+  form as the defect.
+- The org listing is read in **one** call, anonymously. Per-repo fetching trips
+  the forge's rate limiter.
+- No hook ships in this release. A blocking gate has to be precise enough not to
+  fail a correct repository first.
+
+[0.1.0]: https://git.fromaitochitta.com/open/repo-standard/src/tag/v0.1.0