[PR] [NET-747] Preserve IPv4-mapped IPv6 addresses in SubnetUtils6 [commons-net]

["AryanRG (via GitHub)" <gi...@apache.org>]

AryanRG opened a new pull request, #412:
URL: https://github.com/apache/commons-net/pull/412

   ## Summary
   - Preserve IPv4-mapped IPv6 literals as 16-byte addresses when parsing SubnetUtils6.
   - Format mapped subnet addresses as IPv6 so the returned addresses can be parsed and range-checked again.
   - Add regression coverage for mapped CIDRs, dotted and hexadecimal forms, round-tripping, and rejection of plain IPv4 text.
   
   Jira: https://issues.apache.org/jira/browse/NET-747
   
   ## Validation
   - New SubnetUtils6Test case: red on unmodified master (31 run, 1 error); green with this change (31 run, 0 failures/errors).
   - Default Maven goal passed on the final three-file commit with `mvn -q` on macOS/JDK 27. `xmllint --noout src/changes/changes.xml` and `git diff --check` passed.
   - Hosted CI is pending; no release artifact was tested.
   
   ## AI assistance
   Kiro with Claude Opus 5.5 assisted with the initial code and regression test. A separate Kiro review checked the exact code diff and independently reproduced the failure before and success after the fix.
   
   ## Checklist
   - [x] Read this project's contribution guidelines.
   - [x] Read the ASF Generative Tooling Guidance.
   - [x] Disclosed the AI tool and extent of assistance above.
   - [x] Ran the default Maven goal successfully.
   - [x] Added a regression test that fails without the runtime change.
   - [x] Explained the change, reason, and validation.
   - [x] Used a meaningful Jira-keyed commit subject and body.


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