tasks(using-yt-tools): close install + hermes-mapping [🟢🟢]

- using-yt-tools-install: ffmpeg 8.1.1 on PATH, venv populated,
  yt-tools 0.1.0 editable, 4 CLIs respond, 67/67 unit tests pass
  on this Windows host.
- using-yt-tools-hermes-mapping: registered as `pending` with
  intended:{mode:auto, category:research}; build-hermes.py emits
  26 skills (1 pending) and SKIPPED.md lists the entry. Promotion
  to `auto` gated on using-yt-tools-test-trigger 🟢.

NB: triggers/url_pattern from the task block's yaml sketch don't
match the mapping schema — they live in SKILL.md description and
Hermes picks them up automatically. Build script only consumes
mode/category/reason/intended/replace-rules.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

hermes/mapping.yaml

@@ -141,3 +141,12 @@ skills:
   update-claude-skills:
     mode: skip
     reason: "Claude-Code-only orchestrator — Hermes uses hermes-installer-skill instead."
+
+  # ─── pending (1 — behavioral audit required) ─────────────────────────
+
+  using-yt-tools:
+    mode: pending
+    intended:
+      mode: auto
+      category: research
+    reason: "Shells out to yt-dlp + ffmpeg and writes ./yt-cache/ in cwd. Behavioral audit via using-yt-tools-test-trigger required before promotion to auto."