feat: create disinto skill package (SKILL.md + helper scripts) (#710)

Add skill/ directory implementing the Agent Skills open standard (SKILL.md
format) for the disinto factory. Includes:

- SKILL.md with YAML frontmatter, 9-agent architecture overview, env var
  documentation, 6 common workflows, and gotchas section (170 lines)
- scripts/factory-status.sh — query agent status, open issues, CI pipelines
- scripts/file-issue.sh — create forge issues with label resolution and
  secret scanning
- scripts/read-journal.sh — read planner/supervisor/exec journals by date
- templates/issue-template.md — standard issue body format

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

skill/templates/issue-template.md

@@ -0,0 +1,21 @@
+## Summary
+
+<!-- One or two sentences: what and why -->
+
+## Acceptance criteria
+
+- [ ] <!-- Criterion 1 -->
+- [ ] <!-- Criterion 2 -->
+- [ ] <!-- Criterion 3 -->
+
+## Affected files
+
+<!-- List files/directories this issue will touch -->
+
+- `path/to/file.sh`
+
+## Dependencies
+
+<!-- List issue numbers this depends on, or "None" -->
+
+None