refactor: ScoreBreakdown struct fields → v2.1 names (deferred debt from cc4361f)

[ubercylon8]

Summary

Resolves the ScoreBreakdown struct field rename that was explicitly deferred across two rubric activations:

• 237f2b1 (v2 rubric activation, 2026-04-24): deferred due to sweep scope — "requires a coordinated sweep across all 45+ contracts"
• cc4361f (v2.1 rubric activation, 2026-04-25): re-deferred for same reason, documented in docs/PROPOSED_RUBRIC_V2.1_SIGNAL_QUALITY.md §"Deferred (out of scope for v2.1 activation)"

This PR closes that debt by sweeping all 48 per-test test_logger.go copies + the canonical template + all 35 test *.go files that initialise ScoreBreakdown{}.

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Field Mapping

Renamed (5 fields)

Old Go field	Old JSON key	→	New Go field	New JSON key	v2.1 budget
RealWorldAccuracy	realWorldAccuracy	→	APIFidelity	apiFidelity	0–2.5 (2a)
TechnicalSophistication	technicalSophistication	→	IdentifierFidelity	identifierFidelity	0–1.5 (2b)
SafetyMechanisms	safetyMechanisms	→	TelemetrySignalQuality	telemetrySignalQuality	0–2.0 (2c)
DetectionOpportunities	detectionOpportunities	→	ExecutionContextFidelity	executionContextFidelity	0–1.0 (2d)
LoggingObservability	loggingObservability	→	SchemaMetadata	schemaMetadata	0–1.0 (3a)

Added (3 new fields)

New Go field	New JSON key	v2.1 budget
DocumentationCompleteness	documentationCompleteness	0–1.0 (3b)
LoggingPlumbing	loggingPlumbing	0–0.5 (3c)
OperationalHygiene	operationalHygiene	0–0.5 (3d)

Mapping rationale for legacy tests (v1/v2 — compilation only, no re-scoring)

Legacy tests preserve their existing numeric values; the field names are renamed to the closest semantic v2.1 equivalents. The three new fields default to 0.0. No Score or RubricVersion values were modified.

Full rationale: docs/SCOREBREAKDOWN_FIELD_MIGRATION.md

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Scope

• 86 files changed (commit e433f07)
• 48 × test_logger.go struct definition (all per-test copies + canonical template)
• 36 × test *.go struct initialisations (35 tests + TEMPLATE-UUID.go)
• 1 × docs/SCOREBREAKDOWN_FIELD_MIGRATION.md (new)
• gofmt -l clean on all changed files ✅
• Zero new go vet errors (all failures are pre-existing: missing embedded binaries, missing platform files)

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Consumer-side work needed before merge

⚠️ This is a hard wire-format cutover. The JSON keys in scoreBreakdown.* change. Two consumers must be updated before results from post-merge builds are ingested:

1. ProjectAchilles (~/F0RT1KA/ProjectAchilles/)

Both backend/ and backend-serverless/ must be updated in lockstep (they are mirrors — drift causes silent data drops):

• src/services/browser/metadataExtractor.ts — replace old regex extractions with new field names
• src/types/test.ts — rename fields in TestMetadata/TestDetails/ScoreBreakdown interface
• src/services/browser/testIndexer.ts — wire new fields through indexer pipeline
• src/services/agent/test-catalog.service.ts — update catalog persistence/lookup
• src/services/browser/__tests__/metadataExtractor.test.ts — update extraction tests

Detailed code snippets in docs/SCOREBREAKDOWN_FIELD_MIGRATION.md §"ProjectAchilles".

2. Elasticsearch indices (achilles-results-*)

• Update Kibana dashboards/saved searches that reference old field names (scoreBreakdown.realWorldAccuracy, etc.)
• Existing documents retain old field names; new documents use new names — cross-version queries should branch on testMetadata.rubricVersion

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References

• docs/SCOREBREAKDOWN_FIELD_MIGRATION.md — full migration guide
• docs/PROPOSED_RUBRIC_V2.1_SIGNAL_QUALITY.md — rubric spec (§"Deferred" section documents the debt this PR closes)
• Deferred in: 237f2b1, cc4361f
• Re-scored triad: 7b05b7c

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