feat(hooks+skills): destructive-bash confirm + architecture suite + problem-solving routing

Three improvements bundled together:

1. New hook — `destructive-bash-confirm.py` (PreToolUse/Bash):
   Gates `git push --force`, `git reset --hard`, `git clean -f`,
   `git branch -D`, and `rm -rf` behind a confirmation modal with the
   command, local context (branch, uncommitted counts, targeted paths),
   and a severity banner. Elevates severity when force-pushing protected
   branches (main/master/develop/release/prod) or when rm -rf targets
   root, home, or wildcard paths. Reuses _common.py.

2. Architecture suite rename — the "Part of the arch-* suite" footer in
   arch-design, arch-decide, arch-document, arch-evaluate descriptions
   now reads "Part of the architecture suite (arch-design / arch-decide
   / arch-document / arch-evaluate + c4-analyze / c4-diagram for
   notation-specific diagramming)." Matching footers added to c4-analyze
   and c4-diagram. c4-* keep their framework-specific prefix (C4 is a
   notation, arch-* is framework-agnostic workflow) but are now
   discoverable as suite members.

3. Problem-solving cluster routing — added YAML frontmatter with
   descriptions (including "Do NOT use for X (use Y)" clauses) to
   debug/SKILL.md and fix-issue/SKILL.md. Previously both had no
   frontmatter at all, which broke skill-router discovery. The four
   cluster members (debug, fix-issue, root-cause-trace, five-whys) now
   route unambiguously by description alone.

1 files changed, 1 insertions, 1 deletions

diff --git a/c4-diagram/SKILL.md b/c4-diagram/SKILL.md
index 57b056f..15948e4 100644
--- a/c4-diagram/SKILL.md
+++ b/c4-diagram/SKILL.md
@@ -1,6 +1,6 @@
 ---
 name: c4-diagram
-description: Generate C4 architecture diagrams from a textual description of a software system. Use when the user describes a system they want to diagram, or wants to create architecture diagrams for a planned/proposed system.
+description: Generate C4 architecture diagrams from a textual description of a software system. Use when the user describes a system they want to diagram, or wants to create architecture diagrams for a planned/proposed system. Dispatched by arch-document for context and container views; usable standalone when the system is described in prose rather than existing code. Part of the architecture suite (arch-design / arch-decide / arch-document / arch-evaluate + c4-analyze / c4-diagram for notation-specific diagramming).
 argument-hint: "[description or diagram level]"
 ---