Phase18f docs and 0 8 0 finalize#97

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feature/phase18f_docs_and_0_8_0_finalize

Commits on Apr 29, 2026

phase 18a: port E2ERegistry to heapless::FnvIndexMap

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phase 18b: SubscriptionManager off std::vec::Vec on the no_std path

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phase 18c: ungate StaticE2EHandle; add StaticSubscriptionHandle

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phase 18d: drop std from `client` / `server` Cargo features

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phase 18d follow-up: actually compile for thumbv7em-none-eabihf

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phase 18e: add no_std-target CI gate (thumbv7em-none-eabihf)

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phase 18f: docs sweep, examples on Static*Handle, finalize 0.8.0

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