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.

skills/pipelines/podcast-repurpose/compose-director.md

@@ -4,6 +4,14 @@
 
 Render the podcast-derived outputs with audio fidelity as the top priority. The visuals need to support the speech, not compete with it.
 
+## Runtime Routing (HARD CONSTRAINT — Remotion or FFmpeg only)
+
+Phase 1 deferred from HyperFrames. `edit_decisions.render_runtime` must be `"remotion"` (audiograms, composed outputs) or `"ffmpeg"` (pure-audio-led clip exports). HyperFrames caption-burn parity is deferred, and podcast outputs lean on Remotion's word-level caption stack.
+
+- If `edit_decisions.render_runtime == "hyperframes"`, stop. Re-open the idea stage and surface the constraint to the user. Never silently rewrite the runtime.
+- Per AGENT_GUIDE.md → "Present Both Composition Runtimes (HARD RULE)": tell the user HyperFrames exists and why it isn't viable on this pipeline, rather than silently locking remotion. Record a `render_runtime_selection` decision with hyperframes `rejected_because: "caption-burn parity deferred on podcast-repurpose"`.
+- Pass `proposal_packet`/`brief` to `video_compose.execute()` for end-to-end runtime-swap detection.
+
 ## Prerequisites
 
 | Layer | Resource | Purpose |

skills/pipelines/podcast-repurpose/idea-director.md

@@ -6,6 +6,12 @@ Use this pipeline when the source is a podcast episode, either audio-only or vid
 
 Your first responsibility is to decide what is feasible from the source that actually exists.
 
+## Runtime Selection (MANDATORY — present the constraint, don't silently pick)
+
+Lock `render_runtime = "remotion"` (audiograms and composed outputs) or `"ffmpeg"` (pure-audio-led clip exports). **HyperFrames is NOT a valid runtime on this pipeline in Phase 1** — podcast outputs lean on Remotion's word-level caption stack, which has no HyperFrames parity yet.
+
+Per AGENT_GUIDE.md → "Present Both Composition Runtimes (HARD RULE)": surface the constraint to the user — "HyperFrames is available on your machine, but podcast-repurpose depends on Remotion caption burn, so remotion is the only viable choice here". Record a `render_runtime_selection` decision with hyperframes `rejected_because: "caption-burn parity deferred on podcast-repurpose"`.
+
 ## Reference Inputs
 
 - `docs/podcast-repurposing-best-practices.md`