Add HyperFrames skills

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011h6NB8JQtfPc6eRCefEzBB

.agents/skills/hyperframes/references/route-briefs.md

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+# Route briefs (moved)
+
+Each route's interview entry — must-haves, conditional questions, deferred asks,
+pitch-eligible fields, and whether the run-shape questions apply — now lives in that
+route's own file, together with its input/output/trigger contract:
+
+`references/routes/<workflow>.md` — e.g. `routes/faceless-explainer.md`,
+`routes/pr-to-video.md` (including the PR-size → length table).
+
+The interview procedure itself (the eight steps) is `references/intent-interview.md`.
+Field semantics and question rules: `hyperframes/references/brief-contract.md` § 2–3.