Knowledge wiki: add confidence, questions, and contradictions fields

[mindsocket]

Context

From the memory-wiki comparison (issue #100). memory-wiki tracks epistemically unresolved state at the page level using lightweight frontmatter fields. These are low-overhead additions that complement the claims model (issue #102) and add meaningful queryable state without needing full claim machinery.

Decision: add confidence, questions, and contradictions as optional fields on knowledge wiki page types. Do not add updatedAt (no freshness/decay rules planned).

Fields to add

On concept, entity, and synthesis types in schemas/_knowledge_wiki.json:

Field	Type	Description
confidence	number (0–1)	Page-level confidence score in the content
questions	string[]	Open questions this page hasn't resolved
contradictions	string[]	Known conflicts with other pages or sources

All three are optional. source, note, and index types do not get these fields.

Rules to add

Add to the rules array in _knowledge_wiki.json. Each rule only triggers when its triggering field is present — pages without these fields are unaffected.

• open-questions (category: best-practice) — flags pages where questions is present and non-empty. Communicates that the page has unresolved questions worth addressing.
• contradictions-present (category: coherence) — flags pages where contradictions is present and non-empty. Surfaces known conflicts for review.
• low-confidence (category: quality) — flags pages where confidence < 0.5. Indicates content that is uncertain enough to warrant review or supporting evidence.

Acceptance criteria

• All three fields validated on concept, entity, synthesis; absent from other types
• All three rules fire on pages with the triggering fields in the relevant state; silent otherwise
• Rules are covered by unit tests

Reference

docs/memory-wiki-research.md — "Questions and contradictions arrays" section; notes on fields and rules