feat(cli): shared TTS/BGM auth preflight + caption and skill-workflow fixes (#1697)

* fix: handle caption skin workflow

* docs(skills): simplify the finalize step across video workflows

- Drop --strict-layout; all skills use plain `hyperframes inspect`
- Add the caption text_box_overflow false-positive note to faceless-explainer
- On a failed check, the orchestrator makes the cheapest safe edit itself
  (no worker re-dispatch / Step 3 backtrack language)
- Snapshot: glance at the stitched contact-sheet.jpg and move on

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* feat(auth): onboarding-first `auth status` + shared TTS/BGM preflight

When no HeyGen credential is configured, `hyperframes auth status` now
prints registration-first guidance instead of a terse error:

- Interactive / agent-driven sessions get sign-in guidance led by
  `hyperframes auth login` (the OAuth step that also creates an account
  and is shared with heygen-cli), and never steer users to a per-repo
  `.env`. CI / non-interactive runs get a terse note. Exit 1 is kept so
  the "am I logged in?" `$?` contract still holds.
- It probes which local engine voice/music will fall back to (Kokoro /
  MusicGen, mirroring the skill resolution order) and whether their
  Python deps are installed, with a pip hint when missing. `--json`
  exposes `recommended_action` + `offline_engines` for skills to branch.
- `doctor` gains matching "TTS (Kokoro)" / "BGM (MusicGen)" checks via
  the same shared probe (findPython/hasPythonModules extracted to
  tts/python.ts; provider resolution in audio/providers.ts).

Every TTS/BGM workflow now relays this at Step 0 (setup) instead of
improvising its own "missing key" prompt: pr-to-video, product-launch-
video, faceless-explainer, website-to-video, music-to-video. The
canonical behavior + key-priority table live once in hyperframes-media.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* feat(pr-to-video): scale recommended video length to PR change size

Step 0 led with a fixed ~60-90s length default. Now the recommended
length is derived from the PR's diff stat (lines added+deleted, nudged
by file count) on a tier scale (trivial ~20-40s → large ~110-180s, hard
cap ~3 min), reusing the same PR peek already done to infer the angle.
The agent states the basis when proposing it, and a huge PR with one
headline change still stays tight. User can always override.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* fix(captions): embed brand fonts whose files use separators

brandFontFaces() matched font files by stripping only whitespace, so an
underscore/hyphen-named file (TT_Norms_Pro_Bold.woff2) never matched the
family key "ttnormspro" — captions shipped with no @font-face, the
font_family_without_font_face bug. Now both family and filename normalize
away all non-alphanumerics; families match longest-key-first so a parent
family can't swallow a more specific one's files (TT Norms Pro vs Mono);
each file is claimed once; "demibold" ranks before "bold"; and when
nothing matches it warns loudly at build time instead of returning "".

Also: parseFonts() falls back to h1/h2/title/hero display roles, and the
frame-worker + caption authoring docs spell out that only shipped font
files render — no system CJK/Devanagari families on the headless renderer.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* fix(hyperframes-media): enforce sign-in preflight on standalone BGM/TTS

A one-off "generate me a BGM" request went straight to local MusicGen
without recommending sign-in: bgm.md/tts.md framed the no-credential path
as an automatic fallback, so the generation path bypassed the Preflight
stop, and the preflight used a bare `hyperframes auth status` that isn't
on PATH in a fresh `npx skills` project.

- Preflight now applies to one-off generation as well as workflows, uses
  `npx hyperframes auth status`, and says: if the CLI can't run, still
  recommend signing in and STOP — never treat "no credential" as a silent
  green light for local generation.
- bgm.md and tts.md point at the Preflight before generating, reframing
  local generation as the fallback the user opts into, not a default.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* docs(auth): add Authentication & API keys guide

Document signing in, the keys each capability (voice, music, capture)
uses, their resolution priority, and the fully local fallback. Add the
guide to the nav and cross-link it from the cloud deploy note and the
CLI env-var reference.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* fix(lint): strip HTML comments in a fixpoint loop (CodeQL)

Single-pass <!-- --> removal can re-form a complete comment from
adjacent markers (e.g. `<<!-- -->!-- ... -->`), letting a decoy
<template> survive and hijack the template-boundary match. Loop to a
fixpoint, mirroring the captions.mjs precedent; add a regression test
that fails on single-pass (2 root findings) and passes on the loop.

Also wrap the build-frame.mjs node:fs imports to satisfy oxfmt — the
new copyFileSync import pushed the line past the width limit, which
was the sole cause of the Format / Preflight CI failures.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* fix(lint): strip HTML comments with a linear scan (CodeQL ReDoS)

The fixpoint loop still ran a /<!--[\s\S]*?-->/ regex per pass, which
backtracks O(n^2) on inputs with many unterminated "<!--" — CodeQL
js/polynomial-redos (high). Looping the same regex (the prescribed
fix) never addressed this; only the regex itself does.

Replace it with an indexOf-based linear strip in utils.ts
(stripHtmlComments), kept in a fixpoint loop so markers that re-form
when a comment is removed are still stripped. 200k unterminated
"<!--" now strips in ~3ms instead of quadratic time; behavior is
otherwise unchanged — unterminated comments are kept verbatim, as the
old regex left them. The re-forming regression test still guards it.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* fix(auth): make TTS/BGM sign-in guidance accurate and runnable

From team review of the not-signed-in onboarding:

- OAuth is a `hyperframes auth login` feature only. The separate `heygen`
  CLI is API-key-only — `heygen auth login` stores a pasted key, it is not
  OAuth and does not create an account. Stop presenting the two CLIs as the
  same OAuth/sign-up step.
- Use `npx hyperframes` in every imperative and runtime hint. Bare
  `hyperframes` is not on PATH on a fresh machine (command not found); only
  `npx hyperframes` is guaranteed. Also updates the JSON recommended_action.
- Drop `heygen auth login` from the terminal/skill onboarding: it needs its
  own install and there is no `npx heygen`, so it was a command-not-found
  trap. The shared-credential fact stays in the reference docs.

Covers the `auth status` guidance + tests, the Authentication docs, the
shared hyperframes-media preflight (SKILL, requirements, tts, error hints),
and the `npx hyperframes auth status` preflight in every TTS/BGM workflow
(pr-to-video, product-launch-video, faceless-explainer, website-to-video,
music-to-video).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

skills/product-launch-video/scripts/build-frame.mjs

@@ -19,7 +19,14 @@
 //   fonts  — the preset's display family → the brand display font, its body family →
 //            the brand body font, wherever they appear. Empty brand fonts → kept.
 
-import { copyFileSync, existsSync, readdirSync, readFileSync, writeFileSync } from "node:fs";
+import {
+  copyFileSync,
+  existsSync,
+  mkdirSync,
+  readdirSync,
+  readFileSync,
+  writeFileSync,
+} from "node:fs";
 import { dirname, join, resolve } from "node:path";
 import { fileURLToPath } from "node:url";
 import {
@@ -214,8 +221,10 @@ if (brandColors.length && presetColors.length) {
       }
       if (inBlock && /^\S/.test(line)) inBlock = false;
       if (!inBlock) return line;
-      const m = line.match(/^(\s+)([\w-]+):\s*["']?[^"'\n]*["']?\s*$/);
-      if (m && newByKey.has(m[2])) return `${m[1]}${m[2]}: "${newByKey.get(m[2])}"`;
+      const m = line.match(
+        /^(\s+)([\w-]+):\s*(?:"[^"]*"|'[^']*'|#[0-9a-fA-F]{3,8}|rgba?\([^)]*\)|[^#\n]*?)(\s+#.*)?$/,
+      );
+      if (m && newByKey.has(m[2])) return `${m[1]}${m[2]}: "${newByKey.get(m[2])}"${m[3] ?? ""}`;
       return line;
     })
     .join("\n");
@@ -254,7 +263,9 @@ writeFileSync(framePath, md);
 const presetSkin = join(presetDir, presetName, "caption-skin.html");
 let skinCopied = false;
 if (existsSync(presetSkin)) {
-  copyFileSync(presetSkin, join(hyperframesDir, "caption-skin.html"));
+  const skinDir = join(hyperframesDir, ".hyperframes");
+  mkdirSync(skinDir, { recursive: true });
+  copyFileSync(presetSkin, join(skinDir, "caption-skin.html"));
   skinCopied = true;
 }
 
@@ -275,6 +286,6 @@ if (li != null && lc != null && li >= lc) {
 console.log(`✓ build-frame: ${presetName} → ${framePath}`);
 for (const s of summary) console.log(`  ${s}`);
 console.log(
-  `  caption-skin.html: ${skinCopied ? "copied" : "preset ships none — captions will use the default pill"}`,
+  `  .hyperframes/caption-skin.html: ${skinCopied ? "copied" : "preset ships none — captions will use the default pill"}`,
 );
 console.log(`  self-check: keys preserved, ink darker than canvas ✓`);