27 transform cascara to json ld

[odungern]

The latest commits finalize the write-to-file-as-jsonld.

• The json-ld properties are sorted in a canonical sequence.
• The package-cache has been reworked to exhibit set/get/save/load/clear methods.

[Copilot]

Pull request overview

This PR adds JSON-LD export support, canonicalizes JSON-LD output, and refactors package caching so imported packages can persist across sessions.

Changes:

• Adds a central JSON-LD export dispatcher, key sorting, package graph/context JSON-LD transforms, and file-writing support.
• Reworks package cache usage from usePackageCache to PackageCache with localStorage persistence.
• Updates metamodel fixtures/tests for cas:Icon → cas:icon and expands JSON-LD roundtrip coverage.

Reviewed changes

Copilot reviewed 34 out of 38 changed files in this pull request and generated 12 comments.

Show a summary per file

File	Description
src/common/export/jsonld/getJSONLD.ts	Adds central JSON-LD export dispatcher and package graph filtering.
src/common/lib/helpers.ts	Adds canonical JSON-LD key sorting helper.
src/common/lib/platform-independence.ts	Adds cross-platform PLI.writeFile() support.
src/common/lib/messages.ts	Adds/renumbers package validation and file-write messages.
src/common/lib/mvf.ts	Updates JSON-LD/XML vocabulary mappings for graph, icon, and unit.
src/common/import/jsonld/import-jsonld.ts	Uses new validation message code.
src/common/schema/pig/ts/pig-metaclasses.ts	Adds JSON-LD export transforms and adjusts datatype/default handling.
src/common/schema/pig/ts/pig-package-constraints.ts	Updates constraint documentation comments.
src/common/schema/pig/ts/platform-independence.ts	Adds an empty placeholder file.
src/common/schema/README.md	Adds brief schema folder documentation.
src/stores/packageCache.ts	Removes old package cache store.
src/stores/package-cache.ts	Adds persistent package cache store API.
src/plugins/export/jsonld/export-jsonld.vue	Replaces placeholder export dialog with JSON-LD export workflow.
src/plugins/export/jsonld/README.md	Adds JSON-LD export plugin documentation.
src/plugins/import/xml/import-xml.vue	Updates imports to use the new package cache API.
src/plugins/import/reqif/import-reqif.vue	Updates imports to use the new package cache API.
src/plugins/import/jsonld/import-jsonld.vue	Updates imports to use the new package cache API.
src/components/PageDocument.vue	Reads packages through the persistent cache.
src/examples/writeFile-example.ts	Adds examples for PLI.writeFile().
tests/unit/pig-metaclasses.spec.ts	Updates JSON-LD @type expectations.
tests/unit/pig-metaclasses-xml.spec.ts	Updates XML tests for lowercase cas:icon.
tests/unit/pig-metaclasses-jsonld.spec.ts	Adds JSON-LD export roundtrip assertions.
tests/data/XML/21/Project 'Very Simple Model (FMC) with Requirements'.cas.xml	Removes cas:Icon property definition/references.
tests/data/XML/11/Alice.cas.xml	Removes cas:Icon property definition/references.
tests/data/XML/05/Project 'Requirement with Enumerated Property'.cas.xml	Removes cas:Icon property definition/references.
tests/data/TTL/11/Alice.cas.ttl	Updates TTL metamodel links and removes icon shape.
tests/data/TTL/05/Project 'Requirement with Enumerated Property'.cas.ttl	Renames cas:Icon to cas:icon.
tests/data/JSON-LD/27/Dimmer - Semantically Integrated Specification (2021-01-28).cas.jsonld	Renames JSON-LD icon fields.
tests/data/JSON-LD/21/Project 'Very Simple Model (FMC) with Requirements'.cas.jsonld	Renames JSON-LD icon fields.
tests/data/JSON-LD/05/Project 'Requirement with Enumerated Property'.cas.jsonld	Renames JSON-LD icon fields.
public/assets/jsonld/Entity.json	Updates schema property from cas:Icon to cas:icon.
public/assets/jsonld/Relationship.json	Updates schema property from cas:Icon to cas:icon.
public/assets/index.html	Adds heading IDs and updates wording.
public/.htaccess	Expands rewrite and cache-control configuration.
public/assets/.htaccess	Adds asset cache-control configuration.
public/assets/xslt/ReqIF-to-CAS.sef.json	Regenerates compiled ReqIF XSLT artifact.
src/build-info.ts	Regenerates build metadata.

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