docs: the configuration reference no longer links the dev-only tracker-testing procedure, which the distribution does not ship (red CI run 653 on 6a89a92)

Files changed:
- docs/reference/configuration.md

Co-Authored-By: Claude Code <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SnAJ7Z3CpVD3PRbN73QtU2

docs/reference/configuration.md

@@ -364,8 +364,7 @@ for the live suite). While it is set, `task`, `review` and `doctor` read those t
 profile instead of from `wikitool.json` and `.wikitool-local.json`, so one checkout can be run against
 several trackers in turn. A profile is checked like the local file, except that a plain instance-tier
 value is allowed in it; a secret is a reference there too, never a value. The live suite takes its
-throwaway tokens from `WIKITOOL_SECRET_<NAME>`
-([tracker-testing.md](../../instructions/dev/tracker-testing.md)).
+throwaway tokens from `WIKITOOL_SECRET_<NAME>`.
 
 ## MCP submissions