bug(storage): main build fails on undefined decodeStoredMessage in Codex adapter test

[liugddx]

What happened

The current main branch does not compile. packages/storage/src/__tests__/codex-session-adapter.test.ts calls decodeStoredMessage(message), but that identifier is neither declared nor imported.

The failure blocks the repository build and every PR synchronized with current main:

src/__tests__/codex-session-adapter.test.ts(267,26): error TS2304: Cannot find name 'decodeStoredMessage'.

Expected: the Codex adapter regression test compiles and validates every emitted message through the canonical message decoder already imported by the file.

How to reproduce

1. Checkout current main at c79e9eb40ee4a0fcd204fb075427d635989eaaca.
2. Run npm ci.
3. Run npm --workspace @maka/storage run build.
4. Observe TypeScript fail at line 267 before tests execute.

The same failure is visible in main CI run 32664680331 and in PR #3617 after synchronizing main.

Environment

• Maka commit: c79e9eb40ee4a0fcd204fb075427d635989eaaca
• OS: macOS 13 arm64 locally; Ubuntu 24.04 in hosted CI
• Surface: storage build/test
• Node.js: v23.11.0 locally; CI uses the repository Node setup

Logs, screenshots, or additional context

The test file already imports decodeCanonicalMessage from @maka/core/session, and the preceding Codex adapter test uses it to validate adapter output. The equivalent Claude adapter test also validates imported adapter messages with decodeCanonicalMessage.

This appears to be a one-line test typo introduced with #3520: replace decodeStoredMessage(message) with decodeCanonicalMessage(message). No production path needs to change.