hyperframes: add HTML/CSS/GSAP as a parallel composition runtime

Separates creative grammar (renderer_family) from technical engine
(render_runtime) so HyperFrames can stand alongside Remotion as a
first-class runtime instead of masquerading as a Remotion sub-case.
Locks runtime choice at proposal stage and enforces it end-to-end: the
schemas require it, video_compose routes by it, the reviewer fails
closed on silent swaps, and a parametrized contract test walks every
pipeline manifest to ensure each planning-stage skill explains the
conversation to the user. Adds hyperframes_compose (scaffold/lint/
validate/render/doctor/add_block), a playbook -> CSS style bridge, and
vendored HyperFrames Layer 3 skills from commit d291358, pinned via
PROVENANCE.md for future re-sync. Final_review now records
render_runtime_used and runtime_swap_detected so compose lies are
catchable after the fact.

tests/eval/bench_runner.py

@@ -29,6 +29,7 @@ class BenchScenario:
     scenes: list[dict[str, Any]]
     edit_decisions: dict[str, Any] | None = None
     renderer_family: str | None = None
+    render_runtime: str | None = None  # remotion | hyperframes | ffmpeg (optional)
     delivery_promise: dict[str, Any] | None = None
     cuts: list[dict[str, Any]] = field(default_factory=list)
 
@@ -365,7 +366,9 @@ def run_bench(scenarios: list[BenchScenario], verbose: bool = False) -> list[Ben
         if sc.expected_slideshow_verdict is not None:
             try:
                 from lib.slideshow_risk import score_slideshow_risk
-                risk = score_slideshow_risk(sc.scenes, sc.edit_decisions, sc.renderer_family)
+                risk = score_slideshow_risk(
+                    sc.scenes, sc.edit_decisions, sc.renderer_family, sc.render_runtime
+                )
                 actual = risk["verdict"]
                 ok = _verdict_matches(sc.expected_slideshow_verdict, actual)
                 result.checks["slideshow_risk"] = {