Add memory-wiki-strict schema variant

[mindsocket]

Context

From the memory-wiki comparison (issue #100). A memory-wiki-strict schema variant would allow spaces to enforce memory-wiki-compatible frontmatter conventions via sctx's schema validation. This is useful for teams interoperating with openclaw/memory-wiki tooling, or for any space that wants stricter epistemic discipline than the default knowledge_wiki schema.

Decision: add as a new top-level schema file that builds on _knowledge_wiki.json with extra required fields.

Schema design

New file: schemas/memory_wiki_strict.json

Builds on _knowledge_wiki partial and enforces:

Field	Requirement	Notes
id	Required on all types	Stable machine identifier, e.g. entity.alpha
confidence	Required on concept, entity, synthesis	Page-level confidence score (0–1)
updatedAt	Required on all types	ISO 8601 datetime for freshness tracking

pageType compatibility: memory-wiki uses pageType instead of type for page kind. Spaces using this schema with openclaw-sourced content should configure the markdown plugin's fieldMap in space config to map pageType → type. Document this in the schema description.

The id, confidence, and updatedAt requirements should be expressed as additional required constraints layered on top of the _knowledge_wiki $defs, or via a new set of $defs that extend them.

Potential structure

{
  "$id": "sctx://memory_wiki_strict",
  "title": "Memory Wiki Strict",
  "description": "...",
  "allOf": [{ "$ref": "sctx://_knowledge_wiki" }],
  "oneOf": [
    { "$ref": "#/$defs/source" },
    { "$ref": "#/$defs/concept" },
    // ...
  ],
  "$defs": {
    // Each $def extends the _knowledge_wiki version with additional required fields
    "concept": {
      "allOf": [
        { "$ref": "sctx://_knowledge_wiki#/$defs/concept" },
        { "required": ["id", "confidence", "updatedAt"] }
      ]
    },
    // ...
  }
}

Acceptance criteria

• memory_wiki_strict.json is a valid top-level sctx schema
• Pages missing id, confidence (on concept/entity/synthesis), or updatedAt fail validation
• knowledge_wiki.json is unaffected (no required field changes there)
• Schema description documents the fieldMap config pattern for pageType compatibility
• Smoke test or fixture covers the strict schema

Reference

docs/memory-wiki-research.md — "Is a memory-wiki schema worth adding?" section and decision note