docs(plan5): companion chat design spec

Scope B (knowledge assistant + drafting via pending_changes approval chain),
lean Anthropic-SDK runtime (supersedes the top-level spec's Mastra wording),
extensible shared tool registry (search/read/propose_change/context), per-Space
ambient companion, SSE turn lifecycle, inline draft card synced with the Inbox,
structural prompt-injection containment. Ignore .superpowers/ brainstorm dir.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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2026-06-01 17:49:08 +10:00
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@@ -3,3 +3,4 @@ node_modules/
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