Add openrewrite module: Boot 2.7 to 3.5 to 4.0 upgrade with OpenRewrite recipes, leftovers and CI gate

Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01Gth99spB1CzQmBFofXmU4Z
2026-09-28 08:40:08 +00:00
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+# 08-ci-gate (mvn rewrite:dryRun, exit code decides the CI job)
+legacy app,   -Drewrite.failOnDryRunResults=true (the name you would guess): exit code 0
+legacy app,   -DfailOnDryRunResults=true (the real user property):          exit code 1
+migrated app, -DfailOnDryRunResults=true:                                   exit code 0