fix(styles): make the anime-ghibli playbook loadable again

[bbudaedu]

The defect

load_playbook("anime-ghibli") raises a ValidationError on current main. Because lib/checkpoint.py::_validate_style_playbook fails closed, that takes down every run using the style:

from lib.checkpoint import init_project
init_project("demo", title="Demo", pipeline_type="animation",
             pipeline_dir=tmp, style_playbook="anime-ghibli")

clean-professional     init_project OK
anime-ghibli           init_project FAILED: CheckpointValidationError
    Unknown or invalid style_playbook 'anime-ghibli'.
    Available playbooks: ['clean-professional', 'flat-motion-graphics',
                          'premium-minimalist', 'anime-ghibli', 'minimalist-diagram'].

The playbook is returned by list_playbooks() and offered by name in pipeline_defs/animation.yaml, so the error names it as an available alternative to itself. A run that selects it cannot write a checkpoint at all.

There is a quieter half too: VideoCompose._build_theme_from_playbook("anime-ghibli") swallows the load error and returns {}, so no themeConfig reaches Remotion and the style silently falls back to the default dark theme at render time.

The repair

Four distinct schema violations. Each was repaired on the side the evidence pointed to — widen the schema where a shipped renderer feature backs the key, conform the playbook where it is only vocabulary drift:

Violation	Side repaired	Evidence
overlays.section_title	schema	The Overlay union in remotion-composer/src/Explainer.tsx renders section_title/stat_reveal/hero_title/provider_chip. The schema allowed stat_card/key_term/code_block — not one of the types the renderer supports. Added all four, plus accent on overlay_style to match the renderer's accentColor prop.
asset_generation extras	schema	scene_type, multi_image_per_scene, images_per_scene, image_variation_guidance, default_particles, default_particle_color, default_vignette map onto real AnimeScene props (images, particles, particleColor, vignette).
identity.category: anime-illustration, pace: gentle	playbook	No code reads either field for behavior — identity.category is only ever written by lib/playbook_generator.py, and hyperframes_style_bridge reads motion.pace, not identity.pace. Using the canonical custom/slow beats expanding a public enum for one style.
color_palette.spirit_glow, golden_hour	playbook	Ad-hoc named colors with no consumer. Folded into the accent array; both hexes are preserved and still referenced by name in consistency_anchors.

After the fix, _build_theme_from_playbook("anime-ghibli") returns the Ghibli palette (primaryColor: "#2D5016", accentColor: "#FFB347", backgroundColor: "#0A0A1A", …) instead of {}.

Why it slipped, and the coverage that stops it recurring

tests/qa/test_07_playbook_intelligence.py:50 loads a hardcoded list of three playbook names — the three that existed when it was written. anime-ghibli and premium-minimalist were added later and never got load coverage.

tests/styles/test_playbook_catalog.py iterates the catalog instead, asserting the invariant that makes this class of bug impossible to ship:

• every name list_playbooks() advertises also passes load_playbook()
• every advertised playbook is accepted by init_project() — guarding the fail-closed checkpoint path specifically
• the schema's overlay vocabulary covers every overlay type the renderer declares

Verification

• 6 of the 15 new tests fail on the unfixed tree (anime-ghibli load, anime-ghibli init_project, and all four overlay types); all pass after.
• Full suite: 964 → 979 passed, 10 skipped, no regressions.
• make lint: passed.

🤖 Generated with Claude Code