fix: quote SKILL.md descriptions with unquoted colons

The colon-space sequences left behind by #905's em-dash-to-colon
sweep make these six front-matter blocks invalid YAML, so skills.sh
skips them during discovery and they can't be installed via
`npx skills`. Quoting the description scalar fixes parsing without
changing the wording.

Fixes #907

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

skills/engineering/code-review/SKILL.md

@@ -1,6 +1,6 @@
 ---
 name: code-review
-description: Review the changes since a fixed point (commit, branch, tag, or merge-base) along two axes: Standards (does the code follow this repo's documented coding standards?) and Spec (does the code match what the originating issue/spec asked for?). Runs both reviews in parallel sub-agents and reports them side by side. Use when the user wants to review a branch, a PR, work-in-progress changes, or asks to "review since X".
+description: "Review the changes since a fixed point (commit, branch, tag, or merge-base) along two axes: Standards (does the code follow this repo's documented coding standards?) and Spec (does the code match what the originating issue/spec asked for?). Runs both reviews in parallel sub-agents and reports them side by side. Use when the user wants to review a branch, a PR, work-in-progress changes, or asks to \"review since X\"."
 ---
 
 Two-axis review of the diff between `HEAD` and a fixed point the user supplies:

skills/engineering/setup-matt-pocock-skills/SKILL.md

@@ -1,6 +1,6 @@
 ---
 name: setup-matt-pocock-skills
-description: Configure this repo for the engineering skills: set up its issue tracker, triage label vocabulary, and domain doc layout. Run once before first use of the other engineering skills.
+description: "Configure this repo for the engineering skills: set up its issue tracker, triage label vocabulary, and domain doc layout. Run once before first use of the other engineering skills."
 disable-model-invocation: true
 ---
 

skills/engineering/to-spec/SKILL.md

@@ -1,6 +1,6 @@
 ---
 name: to-spec
-description: Turn the current conversation into a spec and publish it to the project issue tracker: no interview, just synthesis of what you've already discussed.
+description: "Turn the current conversation into a spec and publish it to the project issue tracker: no interview, just synthesis of what you've already discussed."
 disable-model-invocation: true
 ---
 

skills/in-progress/writing-fragments/SKILL.md

@@ -1,6 +1,6 @@
 ---
 name: writing-fragments
-description: Writing, explore: mine raw fragments, no structure yet.
+description: "Writing, explore: mine raw fragments, no structure yet."
 disable-model-invocation: true
 ---
 

skills/in-progress/writing-shape/SKILL.md

@@ -1,6 +1,6 @@
 ---
 name: writing-shape
-description: Writing, exploit: shape raw material into an article, paragraph by paragraph.
+description: "Writing, exploit: shape raw material into an article, paragraph by paragraph."
 disable-model-invocation: true
 ---
 

skills/productivity/wait-what/SKILL.md

@@ -1,6 +1,6 @@
 ---
 name: wait-what
-description: Stop. That last message did not land: re-pitch it.
+description: "Stop. That last message did not land: re-pitch it."
 disable-model-invocation: true
 ---