[codex] Fix Pinocchio memo JS test fixtures

[onspeedhp]

Summary

Fix the JS test and local validator fixtures that still referenced the pre-migration spl_memo.so artifact after the program crate was replaced by the Pinocchio-based implementation.

This updates the test fixture and docs to use target/deploy/pinocchio_memo_program.so, and adjusts the JS log assertion for the Pinocchio memo log shape.

Why

The current JS client tests fail locally after build-sbf-program because the checked-in setup tries to load target/deploy/spl_memo.so, but the current program crate emits pinocchio_memo_program.so. Once pointed at the correct binary, the test still expected the legacy one-line memo log format rather than the Pinocchio two-line log output.

Validation

• cargo build-sbf --manifest-path program/Cargo.toml --tools-version v1.54
• SBF_OUT_DIR=/Users/mac/Documents/Private\ Payment/memo/target/deploy cargo test --workspace
• cargo clippy --workspace --all-targets -- --deny warnings
• cargo fmt --all --check
• pnpm build in clients/js
• pnpm test in clients/js
• pnpm lint in clients/js
• NODE_OPTIONS="$NODE_OPTIONS --experimental-vm-modules" pnpm exec jest test/unit --watchman=false in clients/js-legacy

Note: legacy validator e2e could not be completed in the Codex command runner because the background validator process does not survive across tool invocations here; the script now points at the current Pinocchio artifact.

[joncinque]

Looks great to me, thanks for fixing this!

Can you just revert the oxfmt-related changes? Those should belong in a separate PR, if they're really needed

cc @febo

[onspeedhp]

Done, reverted the oxfmt-related changes and kept this PR scoped to the Pinocchio fixture/docs updates. Thanks!

[joncinque]

Thanks!