refactor(core): move state-fingerprint helpers to block_executor submodule

[satyakwok]

First step of breaking up the sentrix-core monolith (16k LOC) for debuggability, lowest-risk first: a pure module-split within the crate — zero crate boundary, so no serialization/API surface where a determinism bug could hide.

What moved

emit_apply_profile, emit_state_fingerprint, compute_state_fingerprint, StateComponents, state_components → block_executor/fingerprint.rs (continuing the existing block_executor/{evm,validate} submodule pattern). All are debug/observability helpers gated behind SENTRIX_STATE_FINGERPRINT / SENTRIX_APPLY_PROFILE; they never feed consensus.

Safety

• Pure code motion — function bodies are byte-identical, no logic change.
• state_components + StateComponents stay pub (re-exported at the module path, used by the bin state command); the rest are pub(crate).
• Un-scrambles doc comments that had drifted above the wrong function.

Verification

• cargo check --workspace -D warnings clean (bin re-export resolves).
• cargo test -p sentrix-core: 273 passed, 0 failed (unchanged from before the move).

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 5f71777a-a034-44c8-ba44-7919d199a3eb

📥 Commits

Reviewing files that changed from the base of the PR and between 07d8def and e82b2d9.

⛔ Files ignored due to path filters (1)

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

📒 Files selected for processing (3)

• Cargo.toml
• crates/sentrix-core/src/block_executor.rs
• crates/sentrix-core/src/block_executor/fingerprint.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch refactor/block-executor-fingerprint-module

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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