Add end-to-end pipeline validation command

[natashaannn]

Add end-to-end pipeline validation command

Objective

Introduce a full pipeline validation command that runs all stages and verifies deterministic output.

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Why this matters

This is the first step toward production-grade reproducibility guarantees.

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Parallelization metadata

Track

pipeline

Depends on

• Add assign-speakers pipeline node #46
• Add merge-doc pipeline node #47

Safe to run in parallel with

• remotion cleanup

Merge risk

• medium

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Files in scope

Primary:

• scripts/pipeline/validate.ts

May touch:

• runner.ts

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Required implementation

1. Add validation runner

Execute full pipeline:

• sync
• transcribe
• diarize
• align
• assign
• merge

2. Determinism check

Compare artifact hashes across runs.

3. Report diffs

Highlight stage-level differences.

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Constraints

• read-only validation
• no pipeline mutation

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Acceptance criteria

Functional

• full pipeline executes end-to-end

Determinism

• repeated runs produce identical hashes

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Verification commands

Run validation twice.

Expected result:

• identical artifact hashes

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Explicitly out of scope

• fixing nondeterminism issues
• caching improvements

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Suggested branch

refactor/s7-pipeline-validation

Suggested commit slug

phase-2-step-8-validation