Sprint 3 - Trust Subject Schema + Design Doc Alignment

[rayyagari2-create]

What this adds:

• schemas/v1/trust-subject.schema.json — reference schema for all seven AWF trust subject types (agent, subagent, role_profile, session, graph_node, human_runtime, task). AJV Draft 2020-12 compatible. 23/23 validation tests pass.
• schemas/README.md — updated schema table to include TrustSubject

What this fixes:

• DESIGN-01: Cursor profile updated — ~21 events, per-mode evidence strength split, failClosed per-entry caveat, four known gaps added
• DESIGN-02: subagent/session/human_runtime subject_key patterns now include repo component (prevents trust bleed across repos), OQ-1 resolved, config_hash definition expanded
• DESIGN-03: already aligned, no changes needed

Source of truth: DESIGN-02 v1.1 locked 2026-05-22

Tests: npm test - all pass. npm run demo - VERIFIED.