Consolidated skill for building narrative-driven Manim explainer videos for DSA/algorithm content -- covers both single-path walkthroughs (one algorithm, no brute-force baseline) and brute-vs-optimized comparisons, plus a technique-selection grammar, camera/angle presets, and a mandatory "verified by test" beat so every rendered video is traceable to a passing unit test. Supersedes manim-dsa-storytelling + manim-dsa-single-path as the single entry point for DSA video work; still layers on top of manim-explainer-animations, which owns the base mobject/animation API surface.
