Implements the three pure functions in registry-schema.cjs (isValidGsdRange,
validateEntries, renderMarkdown) that were stubbed in the previous commit, turning
the red suite green: strict per-type schema validation (capability + eos), a
self-contained engines.gsd range validator (no semver dep), and deterministic
Markdown generation with shields.io release badges + per-entry Discussion links.
Regenerates docs/registries/capability-registry.md and adds the Added changeset.
Also hardens the isValidGsdRange fast-check property (letters-only major) so it
cannot intermittently generate a valid prerelease range and flake.
Closes#2182
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Adds the discoverability-registry surface for issue #2182: JSON-sourced
capability/eos catalogs, a pure schema/vocab module (registry-schema.cjs)
with the ADR-857 loop points + ADR-1239 axes, thin validate/gen CLIs,
the registry-entry PR template, README spec, and CONTEXT.md glossary terms.
The three pure functions (isValidGsdRange/validateEntries/renderMarkdown)
are stubbed here so the comprehensive test suite fails first (red), per the
feature-implementation red-first directive; the next commit implements them.
Refs #2182
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
