feat(chat): streaming rewrite + cacheplane parser migration (0.0.14)

[blove]

What

Phase 2 of the chat pipeline redesign (spec: docs/superpowers/specs/2026-05-02-chat-pipeline-redesign-design.md).

• Migrate @ngaf/chat to consume @cacheplane/partial-json@^0.1.1 (replacing @ngaf/partial-json)
• Mark @ngaf/partial-json deprecated at 0.0.2
• Delete the bespoke append-only markdown renderer (~200 LOC)
• Rewrite chat-streaming-md as a ~30 LOC RAF-batched full-reparse component
• Rekey ChatComponent classifier cache by message id + janitor effect
• Add localStorage-gated trace harness (NGAF_CHAT_STREAM_TRACE=1)
• Diagnose the long-output streaming regression (Findings appendix)

Why

The old append-only renderer's delta math (content.slice(lastContent.length)) silently froze when content shrank or reordered. RAF-batched full reparse is simpler, idempotent, and eliminates that bug class. Sharing the partial-JSON parser across projects gives both a stricter tokenizer + identity preservation + finish() semantics.

Versions

• @ngaf/chat: 0.0.13 → 0.0.14
• @ngaf/partial-json: frozen at 0.0.2 (deprecated)
• @cacheplane/partial-json: external dep at ^0.1.1 (published earlier today)

Testing

• nx test chat: 316 tests pass (including 4 new streaming-markdown.component specs and 5 new trace specs)
• nx test langgraph: passes
• Live smoke: 800-word streaming response renders end-to-end. msgCount=2, no DOM teardown, content delivered correctly.

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Project	Deployment	Actions	Updated (UTC)
cacheplane	Ready	Preview, Comment	May 2, 2026 6:44pm