style(no-slop): de-em-dash the internal docs + config (repo now fully clean)

- AGENTS.md (the standard-bearer), _TEMPLATE.md, handoff.md, tools/README.md:
  em-dashes removed by restructuring, banned words replaced; all policy/structure
  and decisions preserved.
- .gitea/.github sync-wiki workflows, .claude/gitea-ship.json, .gitignore: em-dashes
  in comments/log strings/notes removed; YAML/JSON still valid.

The entire tracked repo is now em-dash-free (the lone remaining `—` is inside a
regex character class in tools/build_wiki.py, intentional, matches old titles).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TfzV5QvtPDz8LJS3Pu5VLT

.gitignore

@@ -1,4 +1,4 @@
-# Generated by running the lab apps — never authored, never versioned.
+# Generated by running the lab apps; never authored, never versioned.
 __pycache__/
 *.pyc
 tasks.json