fix(workflows): preserve file inputs in workflow testing

[icecrasher321]

Summary

• Share workflow input schemas between discovery and run validation so file[] fields accept uploaded file objects and preserve their metadata.
• Generate valid file input samples and remove the obsolete files/base64 schema and duplicate type mappings.
• Require canonical file storage keys in both JSON Schema and runtime validation, normalize editor file defaults, and reject reserved input names.
• Cover file input validation, Start-block handling, and indexed sandbox path references in Shell, Python, and JavaScript.

Type of Change

• Bug fix

Testing

• 410 tests across 12 workflow, MCP, Copilot, and Function execution suites passed.
• Sim type-check, repository lint, all 46 repository audits, block registry audit, and docs manifest check.

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

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1 Skipped Deployment

Project	Deployment	Actions	Updated
docs	Skipped		Sep 15, 2026 7:32pm UTC

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge; the previous schema-contract issue is fully fixed and no actionable regression remains.

Summary

This PR unifies workflow input discovery and runtime validation around a shared schema, preserving canonical uploaded-file metadata through workflow testing.

• Requires complete, keyed file references in both MCP JSON Schema and runtime validation.
• Normalizes valid editor file defaults into executable mock payloads.
• Rejects reserved input names and unsupported input types explicitly.
• Adds regression coverage for file validation, Start normalization, and sandbox path references.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  Format[Workflow input format] --> Shared[Shared Zod input shape]
  Shared --> Discovery[MCP JSON Schema]
  Shared --> Validation[Trigger input validation]
  Format --> Sample[Normalized mock payload]
  Sample --> Validation
  Validation --> Start[Start-block normalization]
  Start --> Resolver[Variable resolver]
  Resolver --> Sandbox[Sandbox file mounts]

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_{Reviews (2) · Last reviewed commit: "fix(workflows): align advertised file va..."}

[cubic-dev-ai]

All reported issues were addressed

<sub>Reply with feedback, questions, or to request a fix.

Fix all with cubic | Re-trigger cubic</sub>

[icecrasher321]

@greptile

[icecrasher321]

@cubic-dev-ai review this PR

[cubic-dev-ai]

@cubic-dev-ai review this PR

@icecrasher321 I have started the AI code review. It will take a few minutes to complete.

[cubic-dev-ai]

No issues found across 6 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Re-trigger cubic}