Stream truthful per-destination generation progress

[Ankit6149]

Advances #27 and #29 with real live generation progress.

Implemented:

• safe progress contract for strategy + per-destination queued/generating/revising/complete/needs_review/failed/cancelled states
• progress events never contain prompt, draft, source, repository, or provider response content
• generateStudioPackage emits real transitions from orchestration, including duplicate repair and cancellation
• /api/launch_kit remains JSON-compatible by default and streams NDJSON only when the client explicitly requests it
• Studio opts into NDJSON, incrementally consumes progress, and keeps normal JSON fallback for validation/legacy responses
• action bar shows actual completed/total destination count and live status for each selected destination
• progress status uses polite live-region semantics and existing Cancel generation remains active
• observer failures cannot break generation
• regression coverage pins state transitions, cancellation, privacy, JSON compatibility, streaming, and accessibility hooks

Still open:

• persistence/resume of an in-flight generation across browser/server restart
• provider-specific concurrency and long-form scheduling
• dedicated end-to-end browser acceptance with a real model route
• durable job infrastructure for long-running hosted generation

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1 Skipped Deployment

Project	Deployment	Actions	Updated
signal-flow-studio	Ignored	Preview	Sep 25, 2026 11:27am UTC