* docs: add PRD and ADR for pi clean seam refactor
Introduces two new planning documents for extracting GSD-authored code
out of the vendored pi packages into dedicated @gsd/agent-core and
@gsd/agent-modes workspace packages, establishing a module-system-enforced
boundary that makes future pi-mono upstream updates significantly easier.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
* docs: rename ADR-009 to ADR-010, update cross-references
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
Split flat docs/ into user-docs/ (guides, config, troubleshooting) and
dev/ (ADRs, architecture, extension guides, proposals). Updated
docs/README.md index to reflect new paths.