fix: Planner agent schema validation infrastructure failure

[ashleyshaw]

Problem

The planner GitHub Actions workflow fails during schema validation with an infrastructure error. This is a pre-existing issue affecting all PRs regardless of the planner agent code quality.

Root Cause

Planner schema validation setup issue — likely missing schema definition or validation tool misconfiguration in the workflow/build setup.

Impact

• Blocking: Planner check fails on all PR runs
• Not code-specific: Failures occur regardless of planner agent implementation quality
• Reproducible: Consistent failure across multiple CI runs

Example Failure

planner check failed
Job ran for ~10 seconds before failing
Consistent across all PR commits

Affected Workflows

• planner.yml workflow
• All PRs (planner check)

Related Code

• .github/workflows/planner.yml
• scripts/agents/planner.agent.js
• Schema validation setup

Solution Steps

1. Verify planner agent schema definition exists and is valid
2. Check planner.yml workflow setup for schema validation
3. Ensure schema validation tool is properly configured
4. Test with sample planner agent invocation

Acceptance Criteria

• Planner workflow schema validation passes
• Check runs successfully on test PR
• No errors in workflow logs
• Planner agent functionality can be tested

Labels

• type:bug
• area:automation
• area:infrastructure
• priority:critical
• component:workflows

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Related: PR #634 (planner agent enhancements) blocked by this issue

[linear-code]

LS-818