feat(relation): refuse a template copy as the source identity

[seonghobae]

A template or pasted copy keeps a distinct identity for relation-aware splits (ADR 0003). It cannot reuse the source document identity or become a state transition. Recovery is the computed share of recovered kinds that match known truth versus collapsing every copy to the source.

Complementary to #136 translation, #139 summarizes, and #75 method_effects (copied-text as a method source, not an identity). This crate owns copy-versus-source identity.

Local gates:

• `cargo test -p copy_identity --all-targets` GREEN after RED (package did not exist)
• clippy `-D warnings` PASS
• workspace contract PASS
• docstring contract PASS
• lines 14/14; nightly-2026-08-01 branches 6/6

Does not allocate migration `0008`. Does not recreate `payload_semantics`, `validation_core` claim promotion (#57), or other in-flight crates.

Keep this PR draft. Preferred merge remains #46 only when exact-head required Checks pass and a qualifying independent (non-Cursor/CodeRabbit) APPROVE exists. Do not empty-commit.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 7c29e7c and fc9dec9.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (18)

• ARCHITECTURE.md
• CHANGELOG.md
• Cargo.toml
• README.md
• crates/copy_identity/Cargo.toml
• crates/copy_identity/src/error.rs
• crates/copy_identity/src/kind.rs
• crates/copy_identity/src/lib.rs
• crates/copy_identity/tests/copy_identity_contract.rs
• crates/copy_identity/tests/crate_contract.rs
• docs/TRACEABILITY.md
• docs/adr/0003-relational-event-multiple-membership.md
• docs/adr/README.md
• docs/research/copy-identity.md
• docs/research/standards-and-literature.md
• docs/validation/temporal-event-foundation.md
• scripts/check_workspace_contract.py
• tests/quality/test_check_docstrings.py

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[seonghobae]

Current head 37d8697 merges protected main and fixes the previous exact-head CI root cause: repository rustfmt ordering in the copy-identity exports/tests. Focused proof passed: cargo fmt --all -- --check, cargo test -p copy_identity --offline (6 tests), workspace contracts, documentation validation, Rust docstring contract, and git diff --check. The exact-head Checks are rerunning; merge remains gated by one qualifying independent approval.

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

[seonghobae]

Please perform an exact-head OpenCode review of 37d8697 against base main at 7c29e7c. Review only this SHA; do not merge or update the branch.

[seonghobae]

Current-head validation update (fc9dec9): fixed the quality contract to derive the Rust crate count from scripts/check_workspace_contract.py instead of hard-coding 10. Local evidence: 89 quality tests passed; coverage 100% (991/991 statements, 442/442 branches); workspace, docstring, documentation, and diff checks passed. Please review and rerun Checks against this exact head; merge remains subject to the repository's two independent approvals and protected rules.