Fix LineFinder build: migrate to calo transform API from #1908

[oksuzian]

Main is currently broken for every PR buildtest: #1908 removed Calorimeter::geomUtil()/CaloGeomUtil, but the calo-cluster matching added to LineFinder in 0d17255 (2026-07-20, after #1908 branched) still calls it, so CosmicReco/src/LineFinder_module.cc no longer compiles against main (e9b2fbd1). First seen on #1911's retest:

scons: *** [build/al9-prof-e29-p103/Offline/tmp/CosmicReco/src/LineFinder_module.os] Error 1

Any PR retested against current main fails the same way, on a file it doesn't touch.

This migrates the one surviving call site to the transforms #1908 hoisted onto the Calorimeter interface — the same pattern #1908 itself applied in CalPatRec (CalTimePeakFinder_module.cc:203-204, CalLineTimePeakFinder_module.cc:154-155):

- _calorimeter->geomUtil().mu2eToTracker(_calorimeter->geomUtil().diskToMu2e(cl.diskID(), cl.cog3Vector()));
+ _calorimeter->mu2eToTracker(_calorimeter->diskToMu2e(cl.diskID(), cl.cog3Vector()));

The transforms are numerically identical to the old CaloGeomUtil ones, so this is a pure compile fix with no behavior change. grep -rn geomUtil confirms this was the only remaining reference in the tree.

🤖 Generated with Claude Code

[FNALbuild]

Hi @oksuzian,
You have proposed changes to files in these packages:

• CosmicReco

which require these tests: build.

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⌛ The following tests have been triggered for 4ea39b2: build (Build queue - API unavailable)

About FNALbuild. Code review on Mu2e/Offline.

[FNALbuild]

☀️ The build tests passed at 4ea39b2.

Test	Result	Details
test with	✅	Command did not list any other PRs to include
merge	✅	Merged 4ea39b2 at e9b2fbd
build (prof)	✅	Log file. Build time: 04 min 20 sec
ceSimReco	✅	Log file.
g4test_03MT	✅	Log file.
transportOnly	✅	Log file.
POT	✅	Log file.
g4study	✅	Log file.
cosmicSimReco	✅	Log file.
cosmicOffSpill	✅	Log file.
ceSteps	✅	Log file.
ceDigi	✅	Log file.
muDauSteps	✅	Log file.
ceMix	✅	Log file.
rootOverlaps	✅	Log file.
g4surfaceCheck	✅	Log file.
trigger	✅	Log file.
check_cmake	✅	Log file.
FIXME, TODO	✅	TODO (0) FIXME (0) in 1 files
clang-tidy	➡️	2 errors 18 warnings
whitespace check	✅	no whitespace errors found

N.B. These results were obtained from a build of this Pull Request at 4ea39b2 after being merged into the base branch at e9b2fbd.

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