Docs audit fixes: kiosk code drift, PowerShell chains, broken links, leaks

From the Fable/Opus documentation audit (8 confirmed + verified
lab-drift the run's session limit had cut short):
- HIGH: the lab's kiosk _kiosk_find_item block showed the pre-stage-17
  row-id resolver as current; replace with the shipped gagelabtag /
  numeric-tail resolver, fix the stale 'resolved by row id' prose and
  the 'stage-7 code is corrected' note.
- MED: the badge _external_lookup block used dict-only row access that
  breaks on a tuple cursor; use the tuple-or-dict form shipped. Split
  '&&' command chains (fail in PowerShell 5.1) in the lab.
- LOW/link: the Windows note's [DEVELOPMENT-SETUP] link dropped the .md
  and 404'd in four docs; fix. Correct the stage-6a->16a comment and
  the lab-stage tag range (..16 -> ..17).
- Leaks: drop /home/camp path from ADR-006, the internal gitea host
  from PLUGINS.md.
- Windows: add an mklink junction note for the external-plugin symlink
  dev loop.
- CI: prime root to mysql_native_password so pymysql connects to the
  MySQL 8 service without the cryptography package (and its kit wheel).

docs/PLUGIN-EXTERNAL-REPO.md

@@ -10,7 +10,7 @@ is required for v1 (pip distribution is deferred to v2 per ADR-003).
 > **Windows / VS Code:** command examples use the Linux venv path
 > `venv/bin/python`; on Windows use `venv\Scripts\python` and
 > `$env:FLASK_APP="shopdb"` (not `export`). Full Windows onboarding:
-> [DEVELOPMENT-SETUP](DEVELOPMENT-SETUP).
+> [DEVELOPMENT-SETUP](DEVELOPMENT-SETUP.md).
 
 
 If you have not written a plugin before, start with
@@ -77,6 +77,11 @@ git clone https://github.com/ge-aero/wjsf-shipping.git
 cd shopdb-flask
 ln -s ../../wjsf-shipping plugins/shipping
 #    (use an absolute path if you prefer: ln -s "$(pwd)/../wjsf-shipping" plugins/shipping)
+#
+# Windows: use a directory junction instead of ln -s. In an ADMIN prompt
+# (or with Developer Mode on) from the shopdb-flask dir:
+#    mklink /D plugins\shipping ..\..\wjsf-shipping
+# The plugin loader treats a junction the same as a real directory.
 
 # 3. Set up the framework as usual.
 python3 -m venv venv