upstream(protocol): integrate 1bd15c9bfd24

[poidh-ultra-maintenance]

Integrate picsoritdidnthappen/poidh-v3 branch main.

From 23e1e51cf98d29f00dc657f87ddd67d1f0f08e9d to 1bd15c9bfd2441fd7cd712c5992f4bddf6324e10 (13 commits, 10 files).

Complete commit/file accounting: upstream/tasks/protocol.json. Source comparison.

Affected areas: docs-site/docs.

Preparation: integrated.

Validation: candidate CI must run upstream tests, Ultra regression/API checks, and Cloudflare builds. No tests run in the credentialed preparation job. Check results are attached to this PR by CI.

Remaining review: confirm behavior, licenses, intentional differences, and test results. Deployment destinations require independent on-chain verification.

• Maintainer reviewed the complete upstream range and Ultra differences
• Required checks passed
• Any adapted or intentionally different changes have a reason recorded

Incorporation advances only when the integration and its record are merged into the default branch. Do not merge unresolved integration tasks.

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