ci: lowercase runjags::findjags() in test-coverage and copilot-setup

Follow-up to the #207 Claude advisory: R-CMD-check.yaml on
cran-submission was already updated to the lowercase form
runjags::findjags(); test-coverage.yaml and copilot-setup-steps.yml
were not. The two casings are aliases at runtime, so this is purely
a consistency fix to avoid a stale-feeling diff once 0.1.0 lands.

R-CMD-check.yaml itself is left alone here — it'll pick up the
lowercase form (plus several other r-lib action version bumps) when
cran-submission merges.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: d-morrison

.github/workflows/copilot-setup-steps.yml

@@ -102,7 +102,7 @@ jobs:
           withr::local_options(warn = 2)
           library(rjags)
           library(runjags)
-          runjags::findJAGS()
+          runjags::findjags()
           runjags::testjags()
         shell: Rscript {0}
 
@@ -119,7 +119,7 @@ jobs:
           Rscript -e 'cat("runjags version:", as.character(packageVersion("runjags")), "\n")'
           echo ""
           echo "JAGS location (from runjags):"
-          Rscript -e 'print(runjags::findJAGS())'
+          Rscript -e 'print(runjags::findjags())'
           echo ""
           echo "Running JAGS test:"
           Rscript -e 'runjags::testjags()'

.github/workflows/test-coverage.yaml

@@ -57,7 +57,7 @@ jobs:
            withr::local_options(warn = 2)
            library(rjags)
            library(runjags)
-           runjags::findJAGS()
+           runjags::findjags()
            runjags::testjags()
         shell: Rscript {0}
 

NEWS.md

@@ -8,6 +8,9 @@
   - Grant `issues: write` and allow `gh issue` invocations so Claude
     can file follow-up issues for work deferred out of the current PR
     instead of burying it in a comment.
+* Standardized `runjags::findjags()` casing across `test-coverage.yaml`
+  and `copilot-setup-steps.yml` to match the `R-CMD-check.yaml` form
+  arriving with the 0.1.0 release (#207 advisory).
 * Re-assign reviewers to a PR's human assignees (filtered via
   `type == "User"`) when Claude pushes commits during a `@claude` or
   `Claude Code Review` run; if Claude makes no commits, the original