feat: voice directive for all skills (v0.12.3.0) (#520)

* feat: add voice directive to skill preamble with tiered context/concreteness/humor

Adds a Voice section to all skill preambles via the template resolver.
Three new subsections: context-dependent tone (YC partner / senior eng /
blog post), concreteness standard (exact commands, line numbers, real
numbers), and connect-to-user-outcomes guidance. Humor calibrated to dry
observations about software absurdity.

Includes eval test for voice directive presence and banned-word filtering.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* chore: regenerate SKILL.md files with voice directive

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: sync package.json version with VERSION file (0.12.2.0)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* chore: regenerate connect-chrome SKILL.md with voice directive

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* chore: bump version and changelog (v0.12.3.0)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "gstack",
-  "version": "0.12.0.0",
+  "version": "0.12.3.0",
   "description": "Garry's Stack — Claude Code skills + fast headless browser. One repo, one install, entire AI engineering workflow.",
   "license": "MIT",
   "type": "module",