docs: establish canonical product and architecture baseline

[seonghobae]

Summary

Canonical product/architecture documentation baseline (PRD, TRD, ADRs, UML/ERD, threat model, traceability, documentation contracts) surgically re-applied on current protected main.

Supersedes conflicting draft #604. Adds ADR-0013 cross-links required by execution-governance contracts.

Evidence

• Local: architecture documentation + execution governance + changelog fragment contracts — 26 passed

Product gates

Merge when python (aggregate + 3.12/3.14), rust, package, fuzz are green.

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Run ID: 9dfd3b1a-4e9e-4d0a-b507-22d96ec86e0b

📥 Commits

Reviewing files that changed from the base of the PR and between 8a56d7b and 839f618.

📒 Files selected for processing (40)

• ARCHITECTURE.md
• CHANGELOG.md
• docs/PRD.md
• docs/README.md
• docs/TRD.md
• docs/adr/0000-template.md
• docs/adr/0001-domain-neutral-measurement-boundary.md
• docs/adr/0002-rust-first-numerical-ownership.md
• docs/adr/0003-content-addressed-measurement-contracts.md
• docs/adr/0004-governed-rubric-item-bank-lifecycle.md
• docs/adr/0005-automated-scoring-raters.md
• docs/adr/0006-relation-safe-model-selection.md
• docs/adr/0007-multilevel-multiple-membership-temporal.md
• docs/adr/0008-true-parameter-recovery-ci.md
• docs/adr/0009-adaptive-rotation-selection.md
• docs/adr/0010-llm-orchestration-and-credentials.md
• docs/adr/0011-canonical-pyo3-public-export-registry.md
• docs/adr/0012-purpose-limited-sensitive-data.md
• docs/adr/0013-continuous-execution-and-documentation-governance.md
• docs/adr/README.md
• docs/changelog.d/canonical-architecture-baseline.md
• docs/doctoring/llm_orchestration_test_time_compute.md
• docs/documentation_coverage.md
• docs/erd/domain-model.puml
• docs/prd_trd_summary.md
• docs/security/threat-model.md
• docs/standards_watch.md
• docs/traceability/requirements-matrix.md
• docs/traceability/research-basis.md
• docs/uml/README.md
• docs/uml/component.puml
• docs/uml/deployment.puml
• docs/uml/domain-public-contract.puml
• docs/uml/item-bank-state.puml
• docs/uml/item-lifecycle.puml
• docs/uml/model-selection-sequence.puml
• docs/uml/scoring-sequence.puml
• docs/verification_validation_plan.md
• tests/test_architecture_documentation_contract.py
• tests/test_architecture_execution_governance_contract.py

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