Reject duplicate release-set root constraints

[voku]

What changed

• reject packages declared in both root require and require-dev before combining the sections
• add a focused regression test that runs the real standalone verifier with conflicting voku/agent-loop constraints

Why

CodeRabbit correctly found after #116 merged that PHP array union ($require + $requireDev) can hide a conflicting duplicate declaration from the right-hand section. That weakens the single-root-authority guarantee.

This follow-up fails deterministically on any duplicate package across the two root sections, before release-set ownership checks continue.

[coderabbitai]

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: bb150c5e-378e-40d1-bfb2-c89fe614941b

📥 Commits

Reviewing files that changed from the base of the PR and between 038b07c and 0843fd6.

📒 Files selected for processing (2)

• tests/AgentLoopReleaseSetVerifierTest.php
• tools/agent-loop/verify-release-set.php

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[sonarqubecloud]

Quality Gate passed

Issues
5 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

[voku]

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