fix(tests): resolve macOS /var symlink in OpenCode plugin test

[Franky100-pig]

On macOS /var is a symlink to /private/var. setUp built self.plugin_root from tempfile's un-resolved path (/var/...), while the Node plugin resolves its own location to /private/var/... via import.meta.url, so the skill-path assertions compared mismatched strings and 5 OpenCodePluginTest cases failed on macOS. Linux CI stayed green because /var is not a symlink there, hiding the bug.

Resolve the temp root with os.path.realpath in setUp so both sides use the same canonical path. No behavior change to the skill or plugin; on Linux realpath is a no-op, so CI is unaffected.

Verification: python3 -m unittest discover -s tests — before: 5 failures (OpenCodePluginTest skill-path assertions); after: Ran 51 tests ... OK.

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