ADR-045: Signal Extensions Plugin Architecture#204

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grparry wants to merge 7 commits intoruvnet:mainfrom

grparry:feat/adr-045-signal-extensions

Commits on Feb 22, 2026

docs(adr): ADR-045 Signal Extensions Plugin Architecture

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Commits on Feb 24, 2026

Implement signal extensions plugin architecture (ADR-045)

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Add AcornflowExtensionHandler as reference implementation

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Fix formatting to pass CI code quality check

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Fix pre-existing CI failures on Windows and Apple Silicon

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Fix rustdoc broken intra-doc links

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Fix copilot-setup-steps.yml YAML indentation

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