Produce content round-trip facts before report projection

[chubes4]

Summary

Finish the facts-first validation path under #1360 after #1635.

• ContentRoundTripReporter::evaluate() produces authoritative findings; ContentRoundTripEvaluation supplies status and the unchanged report projection.
• Retain the public report() facade and evaluate once in HtmlCompilation.
• HtmlValidationOutcome::fromValidationFacts() now receives explicit status/findings for all three validators. Remove the last report-derived factory input and report-reading helpers.
• Preserve text normalization, ignored form-control echoes, comment stripping, thresholds, snippets, classification and finding order.

Full reporting remains enabled. No validator skipping, evidence-mode option, acceptance change or performance claim is introduced.

Verification

Baseline: 16f967e1ecdab102ec33bed384b71afdeb7a2e57.
Candidate: b3697768a06d66bf6e7d307e1e489d03da89df62.

All ten final checks passed: PHP 8.2-8.5 package and WordPress integration suites, plus generic visual parity tools, and solved-site promotion.

• Direct evaluation assertions cover invented-text warnings and valid-text passes; existing text/echo/comment/normalization/snippet tests remain intact.
• Full PHP 8.4 Composer suite passed with 512 MB configured for child commands, including canonical/unit tests, 305 parity fixtures, packaging and install proof.
• Coordinator independently reran the unchanged verifier on baseline and candidate: all 385 HTML fixtures and nine targeted HTML/artifact cases retain identical serialized blocks and full envelopes, excluding only recursive transform_duration_ms.
• Comparison records have SHA-256 245205a2e962e48887b6b93b53408e4c52b60328dbdf682ec19e678efcad261d; comparisons preserve binary bytes and array order through PHP serialization.
• Artifact fixtures exercise nonzero companion/runtime/style/shared-shell/responsive outputs.
• WordPress integration and solved-site promotion passed separately in the final CI runs linked above; they are not claimed from standalone lab tests.

Reproduce

From php-transformer with matching dependencies and sufficient PHP memory inherited by child commands:

composer test
REQUIRE_WP_TESTS=1 WP_TESTS_DIR=/path/to/wordpress-tests composer test:wordpress-integration

The full-corpus comparison command in #1627 applies unchanged to the baseline and candidate above. The checked-in consumer inventory documents the final facts-only outcome boundary.

AI Assistance

OpenAI GPT-5.6 Terra via direct OpenCode implemented and lab-tested the change. GPT-6 Astra via OpenCode coordinated and reviewed the producer/report data flow, independently reran the full corpus/artifact comparison, and prepared this PR under Chris Huber's direction. No release or deployment was performed.