(MOT-4381) refactor(harness): migrate scored E2E assessments

[ytallo]

Summary

• extend AssessmentSpec for required gates whose quality award is scored independently
• migrate eight objective validation scenarios to canonical, versioned assessments
• preserve criterion IDs, score formulas, and the overall blocking conditions
• add truth-table coverage for partial-score and failed-gate edge cases

Validation

• cargo fmt --manifest-path harness/Cargo.toml --all -- --check
• cargo test --locked --manifest-path harness/Cargo.toml -p harness-e2e
• cargo clippy --locked --manifest-path harness/Cargo.toml -p harness-e2e --all-targets -- -D warnings
• git diff --check

Depends on #756

Refs MOT-4381

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📥 Commits

Reviewing files that changed from the base of the PR and between c0f3332 and 8f080f6.

📒 Files selected for processing (10)

• harness/tests/e2e/README.md
• harness/tests/e2e/src/scenarios/assessment.rs
• harness/tests/e2e/src/scenarios/custom_validator.rs
• harness/tests/e2e/src/scenarios/multi_subagent_validation.rs
• harness/tests/e2e/src/scenarios/subagent_validation.rs
• harness/tests/e2e/src/scenarios/subagent_validation_failure.rs
• harness/tests/e2e/src/scenarios/validation_chain.rs
• harness/tests/e2e/src/scenarios/validation_loop.rs
• harness/tests/e2e/src/scenarios/validation_scope_enforcement.rs
• harness/tests/e2e/src/scenarios/validation_self_repair.rs

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[github-actions]

skill-check — worker

0 verified, 56 skipped (no docs/).

Layer	Result
structure	✓
vale	✓
ai	✓
render	✓

Four for four. Nicely done.