fix(skills): pin the bundle to deepgram-skills-v1.7.0

deepgram/skills released 1.7.0 on 2026-10-02 with the same 14-skill manifest,
so `dg skills install` now installs that tag by default. The end-to-end
install suite ran against the live v1.7.0 tarball (14 skills, 12 reference
files, all six destinations).

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

Author: dg-coreylweathers

packages/deepctl-core/src/deepctl_core/skill_bundle.py

@@ -41,7 +41,7 @@
 # Pinned to a released tag, not a branch: an install of a given deepctl
 # version should produce the same skills today and in six months. Override
 # with `--ref` or DEEPCTL_SKILLS_REF to track `main` or test a branch.
-DEFAULT_SKILLS_REF = "deepgram-skills-v1.6.0"
+DEFAULT_SKILLS_REF = "deepgram-skills-v1.7.0"
 
 SKILLS_REPO = "deepgram/skills"
 REF_ENV_VAR = "DEEPCTL_SKILLS_REF"