Replace the turn-report "New Turn" popup row with a cinematic vignette that
plays the moment the player plants a colony: the soundtrack ducks, the world's
1920×1080 backdrop fills the screen, a 960×544 clip of this world being settled
plays in a framed window, and the founding numbers are read out underneath.
Key changes:
- Add `colonyVideos` block (15 clips, one per colonisable planet type) to
artwork JSON; clips are fetched just-in-time via ensureColonyVideo() when a
colony ship reaches a settleable world, keeping the set (~19 MB) out of the
eager manifest
- Add `vega-colony-cue` audio to the eager manifest for the founding soundtrack
- Remove `colonised` from NOTABLE_TYPES and TYPE_LABEL so the event is no longer
announced twice (once in the vignette, once in the turn report)
- Add `sourceWidth()` guard in VegaArt.js to fix a Phaser Video placeholder
width bug exposed by the non-square 960×544 colony clips (2.5× scale issue)
- Apply `sourceWidth()` to portrait and commander video scaling paths as well
- Add depth entry `intro: 78` to VegaScreens.js for the vignette overlay
- Add section 6b to the verifier: checks manifest exclusion, key conventions,
sourceWidth() behavior, turn-report classification, and colony stats
See build-plan trap #23 for the full sourceWidth() explanation.
