fix: remove idempotent lint skip

[akmhatey-ai]

Summary:

• Remove the obsolete idempotent-attribute-is-not-first source lint skip from eo-runtime/pom.xml.
• Remove the associated PDD puzzle text for #5078 while leaving the other open #5078 lint-skip puzzles untouched.

Closes #5153

Validation:

• Desired-state check: <lint>idempotent-attribute-is-not-first</lint> is no longer present.
• XML parse: [xml](Get-Content eo-runtime\pom.xml -Raw).
• Diff hygiene: git diff --check and git diff --cached --check.
• Secret scan: gitleaks protect --staged --no-banner --redact --verbose.

Not run:

• Maven tests, because mvn and java are not available on my local PATH.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

🚀 Performance Analysis

All benchmarks are within the acceptable range. No critical degradation detected (threshold is 100%). Please refer to the detailed report for more information.

Click to see the detailed report

Test	Base Score	PR Score	Change	% Change	Unit	Mode
benchmarks.XmirBench.xmirToEO	12344.739	12291.300	-53.439	-0.43%	ms/op	Average Time

✅ Performance gain: benchmarks.XmirBench.xmirToEO is faster by 53.439 ms/op (0.43%)