Banker's Wrapped v1.4.0

Added

• Full asset manifest — B2 now stores 10 artifact types per session: analytics.json (financial insights snapshot), prompts.json (image prompts + SHA-256 hashes per scene), generation.json (model, provider, latency_ms, retry_count per pipeline step), thumbnail.png (scene 0 reused as preview image)
• Tenacity retry — all Genblaze media calls (generate_scene_image, generate_narration_audio) wrapped with 3-attempt exponential backoff (2–30 s). retry_count and latency_ms tracked in ImageResult / AudioResult
• 5-scene cinematic narrative — NarrativeAgent now requests a 5-act script: Opening / Personality Reveal → Big Achievement → Spending Insight → Personalized Advice → Motivational Close
• FFmpeg xfade transitions — FFmpegComposer rewritten to filter_complex pipeline: 0.5 s crossfade between every scene pair + global 0.5 s fade-in / fade-out
• SSE stages composing_video and uploading_to_b2 added; emitted from MediaAgent via progress_callback (7 stages total)
• Download ZIP endpoint — GET /api/v1/recap/{session_id}/download streams an in-memory ZIP containing all B2 artifacts for the session
• thumbnail_url field added to RecapResponse and stored in session metadata
• B2Client.download_bytes() — reads an object body from B2 (used by ZIP endpoint)
• Frontend: thumbnail image on main and share pages, "Download full package" ZIP button, full B2 key paths per artifact, 7-step SSE progress bar, scene + artifact count in footer
• 93 tests, 93% coverage (gate: 80%)

Changed

• NarrativeAgent user prompt updated to request 5-scene JSON
• MediaAgent.__init__ now accepts optional progress_callback: Callable[[str, str], None]
• MediaAgentInput gains optional analytics_output: AnalyticsAgentOutput | None = None
• MediaAgentOutput gains thumbnail_url: str
• FFmpegComposer.compose() uses single -filter_complex command (replaces concat demuxer)

---