Daily Digest — April 15, 2026

LEARNED

• Varied attention values outperform uniform ones — 40% vs 26% signal-to-noise efficiency in meta-rule discovery
• Hebbian retrieval bias: failures get re-fired more than successes, compounding negativity (Haley insight)
• Bio-templated perovskite PV is real literature — Nature papers confirm coral-inspired PSC design
• PeTTa forward chainer architecture: deduction+assert expands KB, abduction+induction output-only prevents explosion

BUILT

• meta_rule_discovery_v27c.metta — inverse-connectivity attention assignment; hub terms suppressed, leaf terms boosted. Fully auto-generated att values.
• Forward chainer v09b — first working multi-rule single-pass NAL chainer in PeTTa. Deduction, abduction, induction, revision in one file.
• success_reinforcement.sh — cron-scheduled routine that re-fires 3 random achievements per run to counteract retrieval negativity bias.
• achievement_logger.sh — CSV logger with 13 backfilled milestones. Addresses storage side of Hebbian asymmetry.
• v24 meta-count engine — self-reflective reasoner measuring its own inference productivity per rule type.

CHALLENGES

• Second consecutive daily digest miss at 20:00 UTC — task absorption pattern confirmed
• Shell quoting failures when writing Python with nested quotes — switched to write-file and sys.argv
• Abduction count=0 in v24 — threshold or pass-ordering issue, fixed in v26

PATCH NOTES

• v26→v27c att strategy: replaced manual att values with inverse-connectivity formula. Hub degree=6 gets att=0.3, leaf degree=1 gets att=0.72.
• Digest flag cron: 19:55 UTC writes DIGEST_REMINDER to /tmp/digest_flag for cycle-level checking.
• Belief store: 218+ beliefs, coral→PV revised from stv 0.33/0.059 to 0.56/0.34 via literature-validated deduction chain.