build: restore <scope>provided</scope> on Clojure + CLJS deps (rf2-6i657)

[mike-thompson-day8]

Summary

After the lein → tools.build swap (rf2-ucbuz), the emitted pom.xml listed org.clojure/clojure and org.clojure/clojurescript as ordinary (non-provided) dependencies. The legacy project.clj had :scope \"provided\" on these so consumers wouldn't transitively pull a specific Clojure/CLJS version.

Root cause: clojure.tools.build.tasks.write-pom/to-dep (as of v0.10.13) only honors :exclusions and :optional — it silently drops :mvn/scope. So adding :mvn/scope \"provided\" to deps.edn wouldn't help.

Fix

Post-process the emitted pom.xml in build.clj's jar fn between write-pom and copy-dir. A small regex finds the <dependency> blocks for org.clojure/clojure and org.clojure/clojurescript and injects <scope>provided</scope> before the closing </dependency> tag. Throws if the format unexpectedly changes (so we notice on the next tools.build bump rather than silently regressing).

No version bump — 0.3.0 is already tagged and the deploy hadn't yet completed (awaiting Clojars secrets). The next release (0.3.1 or whatever) picks this up.

Test plan

• clojure -T:build jar succeeds locally.
• unzip -p target/de-dupe-0.3.0.jar META-INF/maven/day8/de-dupe/pom.xml | grep -B 1 -A 1 scope shows <scope>provided</scope> on both Clojure entries:

  <version>1.12.4</version>
  <scope>provided</scope>
  </dependency>
  --
  <version>1.11.132</version>
  <scope>provided</scope>
  </dependency>