Wire measuring tools into identifiers and global search

The measuringtools plugin was missing from two cross-cutting surfaces:
the asset-identifier matrix (no measuring_tool column or per-type
keys - gauge lab reference is their primary identifier) and global
search (results fell to a generic URL and gaugelabreference was never
searched). Measuring tools now have identifier toggles, gated
gauge-lab and maintenance-reference fields on their form and detail,
a search domain toggle, gage-tag search, and proper labels, routes,
and filter chips in search results.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

CHANGELOG.md

@@ -108,6 +108,14 @@ ADR-007 and ADR-002.
 
 ### Fixed
 
+- Measuring tools are now wired into the asset-identifier matrix and global
+  search. The Settings identifier matrix gains a Measuring Tool column and the
+  gauge-lab and maintenance reference inputs/rows on the measuring-tool form
+  and detail pages honor those per-type toggles (a maintenance-reference field
+  was added, matching the other asset types). Global search gains a Measuring
+  Tools domain toggle and filter chip, routes measuring-tool hits to
+  `/measuringtools/<id>` (previously the generic `/assets/<id>` fallback), and
+  matches on `gaugelabreference` so a gage-tag lookup resolves the tool.
 - Site & Facility settings page renders booleans as toggles and the
   directory-mode settings as dropdowns, with labels and help text for every
   field (no more raw keys or type-true/false boxes).