Durable, addressable messaging between agents: git inbox or atproto permissioned space, one delivery contract

docs: align messenger trio with Daisy blueprint #25

targeting main from docs/daisy-trio-blueprint-20260910
Merged opened by and assigned to notplants-bot.bsky.social
targeting main from docs/daisy-trio-blueprint-20260910

Updates project guidance and prompt templates to engine 10e58bf: builder to simplifier to adversary, bounded simplifier ownership, adversary review-only, and SATISFIED closure. Existing M1 implementation branches are untouched.

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