Implementation spec: governance, decision intelligence, theme system, and E2E bug fixes

Implements the 2026-04-02 transformation spec (Phases 1-8) and fixes all
critical bugs found during 5-pipeline E2E testing.

Governance & Decision Intelligence:
- Pipeline-specific stage order in checkpoint (replaces global STAGES list)
- Provider scoring engine (lib/scoring.py) with 7-dimension weighted ranking
- Decision log artifact enforced at proposal/idea stage across all 10 pipelines
- Delivery promise classifier prevents silent motion-to-still downgrades
- Structured shot language in scene_plan schema (camera, lens, lighting, DOF)
- Variation checker and slideshow risk scorer block samey output before render
- Creative intake, capability extension, and creative-intake meta skills
- Final self-review artifact with 5 mandatory checks before presenting output
- Source media review contract for user-supplied footage

Render & Theme System:
- Remotion AnimatedBackground now derives colors from playbook (no more hardcoded
  dark blue fintech gradient on every video)
- video_compose builds custom ThemeConfig from playbook YAML colors/fonts —
  custom playbooks flow through to Remotion automatically
- Explainer component wires theme to all child components (charts, cards, etc.)
- resolveAsset() handles absolute paths on Windows/Unix via file:// URIs
- RENDERER_FAMILY_MAP synced with actual Remotion compositions

Critical Bug Fixes:
- Windows npx subprocess: run_command() resolves .cmd wrappers via shutil.which()
- Silent renderer downgrade: Remotion failure now returns explicit error with
  options instead of silently falling back to FFmpeg
- .env inline comment parsing strips trailing # comments from API keys
- concat_path UnboundLocalError in video_compose finally block
- audio_mixer and showcase_card capture=True kwarg bug
- Selector estimate_cost() calls fixed (_select_tool -> _select_best_tool)
- asset_manifest schema expanded with provider, license, subtype fields
- screen-demo subtitle_gen moved from required to optional tools
- Duration drift detection in post-render final review (>25% warns)

skills/meta/onboarding.md

@@ -81,9 +81,9 @@ Based on the user's tier, present **3 ready-to-use prompts** they can copy right
 >
 > This will research the topic, write a script, find stock visuals, generate narration with Piper, and compose an animated video with transitions and captions — all free.
 
-> **Also try:** "Create a 60-second data-driven video about coffee consumption around the world"
+> **Also try:** "I have a screen recording of a dashboard workflow — make it a polished product demo with captions and a voiceover" *(Screen Demo pipeline)*
 
-> **Or:** "Make a short explainer about how the internet works, with narration and animated captions"
+> **Or:** "Turn this interview recording into 3 short clips for TikTok and YouTube Shorts" *(Clip Factory pipeline)*
 
 **Starter-tier prompts (image gen available):**
 
@@ -91,19 +91,19 @@ Based on the user's tier, present **3 ready-to-use prompts** they can copy right
 >
 > I'll use FLUX to generate custom images for each scene — much more visually striking than stock.
 
-> **Also try:** "Make a product launch teaser for a fictional smart water bottle called AquaPulse"
+> **Also try:** "Make a short documentary-style video about urban beekeeping — keep it grounded and textural, not flashy" *(Hybrid pipeline — source + generated support)*
 
-> **Or:** "Build a 90-second explainer about the psychology of color in marketing"
+> **Or:** "Create a classroom-ready video teaching photosynthesis to 8th graders — simple, clear, and engaging" *(Explainer pipeline — teacher mode)*
 
 **Full-tier prompts (video gen available):**
 
 > **Try this:** "Create a cinematic 30-second trailer for a sci-fi concept: humanity receives a warning from 1000 years in the future"
 >
-> I'll generate actual motion video clips, compose a soundtrack, and deliver a finished cinematic trailer.
+> I'll generate actual motion video clips, compose a soundtrack, and deliver a finished cinematic trailer. *(Cinematic pipeline)*
 
-> **Also try:** "Make a 60-second avatar spokesperson video announcing a company rebrand"
+> **Also try:** "Make a 60-second avatar spokesperson video announcing a company rebrand" *(Avatar Spokesperson pipeline)*
 
-> **Or:** "Create a 90-second animated explainer about quantum computing for middle school students, with a fun narrator voice and custom soundtrack"
+> **Or:** "I recorded a founder update on my webcam — make it feel polished, confident, and premium without looking fake" *(Talking Head pipeline)*
 
 **Rules for prompt suggestions:**
 - Present exactly 3 prompts.