docs(skills): add /hyperframes-audio, with a headless carve

Mixing was the one audio surface no skill covered: the effect chain, automation
lanes and the voiceover carve existed with no guidance, so an agent had the
attributes and none of the judgement for using them. The skill teaches the carve
as what it is — a relationship between two tracks, wired like a sidechain, with
the settings on the bed naming the voice — and routes the effect families by the
problem each solves rather than listing parameters.

It ships scripts/carve.mjs because a skill teaching a feature agents cannot
operate is not much of a skill: the analysis needs decoded PCM, and the only other
way in is clicking a Studio panel. Same core functions and same decode rate, so
headless output and panel output are the same three attributes. It finds the voice
and the bed itself — names first, then by ear, measuring how much of each track is
quiet, since a voice stops between phrases and a bed does not — and refuses rather
than guessing when two tracks are too close to call.

References carry the full registry with which parameters can actually be automated
(the four worklet effects expose none, so a lane on one is silently inert) and the
exact JSON of the three attributes.

Counts, catalogues and the core-skill manifest updated in lockstep; the pinning
test in skillsManifest is what caught the two surfaces the maintenance checklist
in CLAUDE.md does not name.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

packages/cli/src/templates/_shared/AGENTS.md

@@ -18,7 +18,7 @@
 
 **Porting an existing composition?** `/remotion-to-hyperframes` translates a Remotion (React) composition into HyperFrames HTML — a source migration, separate from the creation workflows above.
 
-The domain skills (`/hyperframes-core`, `/hyperframes-animation`, `/hyperframes-keyframes`, `/hyperframes-creative`, `/hyperframes-cli`, `/media-use`, `/hyperframes-registry`, `/figma`) and the full capability map live inside `/hyperframes` — it is the single source of truth for which skill handles which intent.
+The domain skills (`/hyperframes-core`, `/hyperframes-animation`, `/hyperframes-keyframes`, `/hyperframes-creative`, `/hyperframes-cli`, `/media-use`, `/hyperframes-audio`, `/hyperframes-registry`, `/figma`) and the full capability map live inside `/hyperframes` — it is the single source of truth for which skill handles which intent.
 
 **Changing how real footage or images look or reveal?** Load `/media-use` and read its `references/media-treatments.md` before editing, even when the request only says dark, flat, boring, retro, private, or “make the reveal cooler.” It governs how footage is treated, never whether media may be used. Use canonical media treatments and seek-safe motion; do not improvise equivalent CSS/SVG filters or overlays.
 

packages/cli/src/templates/_shared/CLAUDE.md

@@ -18,7 +18,7 @@
 
 **Porting an existing composition?** `/remotion-to-hyperframes` translates a Remotion (React) composition into HyperFrames HTML — a source migration, separate from the creation workflows above.
 
-The domain skills (`/hyperframes-core`, `/hyperframes-animation`, `/hyperframes-keyframes`, `/hyperframes-creative`, `/hyperframes-cli`, `/media-use`, `/hyperframes-registry`, `/figma`) and the full capability map live inside `/hyperframes` — it is the single source of truth for which skill handles which intent.
+The domain skills (`/hyperframes-core`, `/hyperframes-animation`, `/hyperframes-keyframes`, `/hyperframes-creative`, `/hyperframes-cli`, `/media-use`, `/hyperframes-audio`, `/hyperframes-registry`, `/figma`) and the full capability map live inside `/hyperframes` — it is the single source of truth for which skill handles which intent.
 
 **Changing how real footage or images look or reveal?** Load `/media-use` and read its `references/media-treatments.md` before editing, even when the request only says dark, flat, boring, retro, private, or “make the reveal cooler.” It governs how footage is treated, never whether media may be used. Use canonical media treatments and seek-safe motion; do not improvise equivalent CSS/SVG filters or overlays.
 

packages/cli/src/utils/skillsManifest.ts

@@ -150,6 +150,7 @@ export function isCoreSkill(name: string): boolean {
 export const FALLBACK_CORE_SKILLS: readonly string[] = [
   "hyperframes",
   "hyperframes-animation",
+  "hyperframes-audio",
   "hyperframes-cli",
   "hyperframes-core",
   "hyperframes-creative",