…red checkers

Add tests for response body removed, property-level add/remove, and
body/property-level minContains/maxContains changes. Also adds a
containsId() helper to reduce test boilerplate.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Replace the getkin/kin-openapi replace directive with a direct dependency
on the oasdiff/kin-openapi feat/openapi-3.1-support-oasdiff branch, which
mirrors feat/openapi-3.1-support but declares module path
github.com/oasdiff/kin-openapi. This eliminates the module path mismatch
that caused go vet to fail on flatten/allof (undefined ExclusiveBound).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Picks up yaml/yaml3 v0.0.3 fixes for YAML anchor/alias handling.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Adds $schema/$defs support and additional 3.1 fixes.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Bumps github.com/oasdiff/kin-openapi to v0.137.0-openapi31.beta.8,
which adds OAS 3.1 support for sibling keywords alongside $ref
(e.g. deprecated:true). Removes the t.Skip from TestOAS31_RefSiblingKeyword
now that kin-openapi correctly honours the sibling and the test passes.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

The rebase switched from getkin/kin-openapi to oasdiff/kin-openapi.
The prefix-matched restore-keys were restoring stale caches from
main-branch runs that contained getkin modules, causing build failures
for oasdiff/kin-openapi-only types like ExclusiveBound.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

The rebase onto main brought in #842's migration to getkin/kin-openapi,
but the 3.1 branch requires oasdiff/kin-openapi for ExclusiveBound and
other 3.1-specific types. This replaces all remaining getkin imports and
sets IsExternalRefsAllowed in the external ref test.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Adds 37 new tests and 16 test data files covering the uncovered paths
in 3.1-specific checkers: body removed, property added, and property
removed for dependent_schemas, pattern_properties, prefix_items,
property_names, if/then/else, content, and min_decreased.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

… and utils

Adds 20 tests covering: exclusiveMin decreased / exclusiveMax increased
paths, 3.1-style type array nullable detection, property-level
dependentRequired changes, all interfaceToString branches, and 3.1
sub-schema traversal (if/then/else/contains/prefixItems/propertyNames/
unevaluatedItems/unevaluatedProperties/contentSchema/patternProperties/
dependentSchemas).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Depend directly on getkin/kin-openapi (PR #1125 branch) instead of the
oasdiff fork. This eliminates the fork sync step and resolves the
transitive module path mismatch that broke flatten/allof tests.

Also adds BoolSchema support for unevaluatedProperties/unevaluatedItems
diff (fixes #844).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

- Remove feature branches from Docker workflow triggers
- Only apply 'stable' tag for non-prerelease version tags

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Translate 302 previously untranslated messages per locale covering
dependentRequired, exclusive-min/max, prefix-items, if/then/else,
min/max-contains, contains, property-names, unevaluated,
dependent-schema, pattern-property, content-encoding/media-type,
and contentSchema.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

For api-tag-added and api-tag-removed, use NewSourceFromSequenceItem
to report the exact line of the added/deleted tag value instead of
the `tags:` field key. Also set only baseSource for deletions and
only revisionSource for additions.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>