feat(method): refuse section boilerplate as unique content

[seonghobae]

Summary

ADR 0004/0012 remaining method-source increment from origin/main 32aa936 after #46 merged. Distinct from drafted stopword_deletion (#145), method_effects (#75), and copy_identity (#143).

• SectionKind keeps report section boilerplate separate from unique latent content.
• refuse_section_as_unique_content fails closed on section boilerplate.
• refuse_section_as_stopword_deletion fails closed on section boilerplate.
• Recovery is the computed share of recovered kinds that match known truth, not a hardcoded rate.
• No migration 0008. No in-flight crate recreation.

Test plan

• RED: section_source_contract failed to compile (E0432) before the exports existed
• cargo test -p section_source --offline --lib --tests (2 lib + 4 contract tests)
• cargo clippy -p section_source --all-targets --offline -- -D warnings
• python3 scripts/check_workspace_contract.py / check_docstrings.py / validate_documentation.py
• cargo llvm-cov lines 81/81; nightly branches 6/6
• cargo test --workspace --offline --lib --tests
• exact-head required Checks on this PR (queued; do not treat as passed)

Do not self-approve or merge until exact-head required checks and a qualifying independent review pass. Keep this draft; do not starve preferred-merge Checks.

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