feat(agents): add PR Walkthrough narrative orientation agent#1947

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dfinson wants to merge 11 commits into

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dfinson:dfinson/feat-pr-review-narrative-walkthrough

Commits on Jun 16, 2026

feat(agents): add PR Walkthrough narrative orientation agent

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fix(agents): address review feedback on pr-walkthrough placeholders and orchestrated path

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feat(agents): port nitcracker techniques into pr-walkthrough agent

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feat(agents): register pr-walkthrough as code-review-full subagent and mark experimental

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fix(agents): address review feedback for pr-walkthrough

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style(agents): fix mechanical lint issues in pr-walkthrough agent

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fix(agents): clarify opinions-vs-editorializing coherence tension

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style(agents): remove bolded-prefix bullet pattern from walkthrough rules

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style(agents): replace ALL CAPS emphasis with bold/italic alternatives

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refactor(agents): extract voice guidance to walkthrough-voice.instructions.md

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fix(collections): restore missing maturity fields dropped during rebase

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