fix(module): harden deferred module initialization

[senamakel]

Follow-up to #12 after its review completed post-merge.

• re-run module file admission immediately before deferred loading, so a replaced artifact cannot inherit an earlier hash attestation
• zero and release module configuration when initialization returns an explicit failure
• name and document the lazy sidecar size/admission rules
• cover malformed and non-lazy sidecar refusal

Local verification:

• cargo fmt --all -- --check
• cargo clippy --locked --all-targets --all-features -- -D warnings
• cargo test --locked --all-features
• cargo check --locked --no-default-features

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📥 Commits

Reviewing files that changed from the base of the PR and between 76b279d and 8ff70bc.

📒 Files selected for processing (4)

• crates/tinybus/src/module/host.rs
• crates/tinybus/src/module/host_test.rs
• crates/tinybus/src/module/transport.rs
• docs/modules/module/README.md

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