fix: replace zsh-incompatible raw globs with find-based alternatives and setopt guards

Zsh's NOMATCH option (on by default) causes raw globs like `*.yaml` and
`*deploy*` to throw errors when no files match, instead of silently expanding
to nothing as bash does. The preamble resolver already handled this correctly
with find, but 38 glob instances across 13 templates and 2 resolvers still
used raw shell globs.

Two fix approaches based on complexity:
- find-based replacement for cat/for/ls-with-pipes patterns (.github/workflows/)
- setopt +o nomatch guard for simple ls -t patterns (~/.gstack/, ~/.claude/)

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

office-hours/SKILL.md.tmpl

@@ -48,6 +48,7 @@ Understand the project and the area the user wants to change.
 3. Use Grep/Glob to map the codebase areas most relevant to the user's request.
 4. **List existing design docs for this project:**
    ```bash
+   setopt +o nomatch 2>/dev/null || true  # zsh compat
    ls -t ~/.gstack/projects/$SLUG/*-design-*.md 2>/dev/null
    ```
    If design docs exist, list them: "Prior designs for this project: [titles + dates]"
@@ -278,6 +279,7 @@ After the user states the problem (first question in Phase 2A or 2B), search exi
 
 Extract 3-5 significant keywords from the user's problem statement and grep across design docs:
 ```bash
+setopt +o nomatch 2>/dev/null || true  # zsh compat
 grep -li "<keyword1>\|<keyword2>\|<keyword3>" ~/.gstack/projects/$SLUG/*-design-*.md 2>/dev/null
 ```
 
@@ -422,6 +424,7 @@ DATETIME=$(date +%Y%m%d-%H%M%S)
 
 **Design lineage:** Before writing, check for existing design docs on this branch:
 ```bash
+setopt +o nomatch 2>/dev/null || true  # zsh compat
 PRIOR=$(ls -t ~/.gstack/projects/$SLUG/*-$BRANCH-design-*.md 2>/dev/null | head -1)
 ```
 If `$PRIOR` exists, the new doc gets a `Supersedes:` field referencing it. This creates a revision chain — you can trace how a design evolved across office hours sessions.