feat: add `plugboard process validate` CLI command#212

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Copilot wants to merge 8 commits intomainfrom

copilot/implement-model-validation-checks

Commits on Feb 15, 2026

Initial plan
Copilot
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Add process topology validation: Johnson's algorithm, cycle detection, and validation utilities

Copilot
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toby-coleman
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Address code review: remove unused ValidationError class and redundant filter

Copilot
and
toby-coleman
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Commits on Mar 4, 2026

Refactor validators to runtime checks accepting process.dict() output

Copilot
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toby-coleman
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Add descriptive header to validation error message

Copilot
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toby-coleman
committed
Add `plugboard process validate` CLI command

Copilot
and
toby-coleman
committed

Commits on Mar 10, 2026