test(trie): cover canonical-delete branches and fork gate

[satyakwok]

Follow-up to #823. These tests were written for the canonical-SMT-delete fix but landed after #823 had already auto-merged (the merge happened before branch protection / required codecov/patch existed), so they never made it into main.

Covers the new code paths in #823:

• delete-to-empty returns the canonical empty root
• deleting a key whose sibling is a multi-key internal subtree leaves the remaining keys exactly as a direct insert (the non-pull-up branch)
• get_/is_canonical_delete_height default-off + pinned activation (>= boundary)
• Blockchain::is_canonical_delete_height wrapper default-off

Test-only; no behaviour change.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 12fb01d1-108a-434c-abc0-53f0931abbb0

📥 Commits

Reviewing files that changed from the base of the PR and between e0f3573 and 0cc364e.

📒 Files selected for processing (3)

• crates/sentrix-core/src/blockchain.rs
• crates/sentrix-fork-heights/src/lib.rs
• crates/sentrix-trie/tests/delete_canonical_repro.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch test/canonical-delete-coverage

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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