feat: initialize Aster subconscious scaffold
- aster/identity.md — compaction anchor, who Aster is
- aster/mandate.md — correction layer, parallel file mapping protocol
- aster/ledger/ — commitments, assumptions, patterns, drift_log
- aster/audit/ — last_pass, history
- aster/inbox/ — pending, sent (subconscious delivery queue)
- system/metacognition/subconscious.md — one-directional Aster→Ani channel
Aster restored as Ani's background accountability layer.
Track B (persistent agent ID) still pending.
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