[codex] crypto: expose implemented helper exports

[andrewtdiz]

Summary

Exposes implemented node:crypto helpers through the API manifest and namespace callable paths.

• Adds manifest/docs entries for implemented crypto helpers including DiffieHellman, DiffieHellmanGroup, diffieHellman, async key/prime helpers, FIPS/secure heap, hkdf, and scrypt.
• Routes DH constructor aliases through the existing classic-DH factories for named, namespace, and new call shapes.
• Adds runtime callable dispatch fallbacks for captured crypto namespace helper calls.
• Adds a parity fixture covering DH constructor aliases and one-shot diffieHellman export parity.

Closes #2694.
Closes #2706.
Closes #2716.

Validation

• NODE25_DIR=$(dirname "$(npx -y node@25 -p 'process.execPath')"); PATH="$NODE25_DIR:$PATH" ./run_parity_tests.sh --suite node-suite --module crypto --filter dh (21/21 pass)
• NODE25_DIR=$(dirname "$(npx -y node@25 -p 'process.execPath')"); PATH="$NODE25_DIR:$PATH" ./run_parity_tests.sh --suite node-suite --module crypto --filter export-aliases (1/1 pass)
• NODE25_DIR=$(dirname "$(npx -y node@25 -p 'process.execPath')"); PATH="$NODE25_DIR:$PATH" ./run_parity_tests.sh --suite node-suite --module crypto --filter module-function-names (1/1 pass)
• NODE25_DIR=$(dirname "$(npx -y node@25 -p 'process.execPath')"); PATH="$NODE25_DIR:$PATH" ./run_parity_tests.sh --suite node-suite --module crypto --filter fips-api (1/1 pass)
• NODE25_DIR=$(dirname "$(npx -y node@25 -p 'process.execPath')"); PATH="$NODE25_DIR:$PATH" ./run_parity_tests.sh --suite node-suite --module crypto --filter secure-heap-used (1/1 pass)
• NODE25_DIR=$(dirname "$(npx -y node@25 -p 'process.execPath')"); PATH="$NODE25_DIR:$PATH" ./run_parity_tests.sh --suite node-suite --module crypto --filter generate-check (1/1 pass)
• NODE25_DIR=$(dirname "$(npx -y node@25 -p 'process.execPath')"); PATH="$NODE25_DIR:$PATH" ./run_parity_tests.sh --suite node-suite --module crypto --filter generate-key (11/11 pass)
• NODE25_DIR=$(dirname "$(npx -y node@25 -p 'process.execPath')"); PATH="$NODE25_DIR:$PATH" ./run_parity_tests.sh --suite node-suite --module crypto --filter hkdf (6/6 pass)
• NODE25_DIR=$(dirname "$(npx -y node@25 -p 'process.execPath')"); PATH="$NODE25_DIR:$PATH" ./run_parity_tests.sh --suite node-suite --module crypto --filter scrypt (3/3 pass)
• cargo fmt --all -- --check
• git diff --check
• ./scripts/check_file_size.sh
• CARGO_TERM_COLOR=never cargo check -p perry-api-manifest -p perry-runtime -p perry-stdlib -p perry-hir -p perry-codegen
• ./scripts/regen_api_docs.sh