Eric Traut 8d142fd63d Validate CODEX_HOME before resolving (#10249) ...

Summary
- require `CODEX_HOME` to point to an existing directory before
canonicalizing and surface clear errors otherwise
- share the same helper logic in both `core` and `rmcp-client` and add
unit tests that cover missing, non-directory, valid, and default paths

This addresses #9222

2026-01-30 15:46:33 -08:00

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