Learn Domain — Feynman-Spine

The Learn domain implements a complete learning and education capability using the Feynman-Spine methodology. It spans 12 skills across 4 architectural layers.

The learning arc

/learn-goal       → set what you want to learn
/learn-survey     → diagnostic placement + recursion floor
/learn-plan       → concept DAG + curriculum builder
/feynman-loop     → core Feynman PMPO loop (explain, gap-find, re-study)
/learn-grade      → sycophancy-corrected external grading
/learn-retain     → FSRS-6 spaced retrieval
/learn-practice   → deliberate practice track
/learn-certify    → OB 3.0 / W3C VC certification

Support skills

Skill	Purpose
/learn-kb	KB registry + adapter management
/learn-about-system	Prometheus stack meta-learning
/learn-harness	Harness detection + capability map
/ui-surface	Cross-harness UI rendering primitive

The optional /sync-status, /sync-peers, and /sync-push skills are distributed by prometheus-companion, which owns cross-machine replication.

Core invariants

• Self-reported fluency NEVER closes a Feynman loop — all 3 mastery conditions must hold
• Pedagogical sycophancy is blocked architecturally — learn-grade routes through sycophancy-correction
• KB content is NEVER forwarded to external APIs — privacy guarantee at all layers