docs(reflow/api): document SSE user_phase field as the stable contract

Replaces the 'alignment work in progress' note with the post-merge contract. Every pipeline:phase SSE event now carries a user_phase field — one of six values (extraction / analysis / headings / translation / assembly / review). That's the stable handle for consumer progress UI; display_name and step_name remain available for richer output but are not part of the public contract. Post-merge wording chosen deliberately. PR #114 on equalify-reflow is landing today; this doc will be correct the moment the merge lands and will briefly be aspirational beforehand. The consumer side should describe the stable contract, not the transitional client-side mapping. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Dylan Isaac committed on Apr 17, 2026, 04:46 PM

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