DPBG/Engram.AI: set maintainer_cut to 0.20

[Lobster-0429]

Weight Adjustment PR

Changes Summary

Metric	Total
Repositories Added	0
Repositories Removed	0
Weights Modified	0
Net Weight Change	0

Justification

Sets maintainer_cut to 0.20 for DPBG/Engram.AI — routing 20% of the repo's emission slice directly to the repo's registered maintainer miner(s), split evenly, before normal scoring. This does not change emission_share (stays 0.0025) or any other repository; total registry emission_share remains 1.0.

maintainer_cut was previously unset (defaulted to 0.0).

Additional Acceptable Branches

• No additional_acceptable_branches changes in this PR
• Proof of merged PR(s) provided above for all additional_acceptable_branches entries

Checklist

• Changes summary table is filled in accurately
• Net weight changes are justified in the Justification section
• Added repositories have correct branch and initial weight