Fixed adapter-manager misreporting missing deps as missing adapter

[allouis]

Node's MODULE_NOT_FOUND errors include a "Require stack" that lists
the calling file's path. The existing heuristic checked whether the
adapter path appeared anywhere in err.message to distinguish
"adapter not found" from "adapter found but has a missing dependency."

Because the adapter's own path always appears in the require stack, the
check always matched, causing missing-dep errors to be silently
swallowed and replaced with a misleading "Unable to find adapter"
message.

Restricting the check to the first line of the error message fixes the
false positive.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 3e66d51 and 5b0f1de.

📒 Files selected for processing (2)

• ghost/core/core/server/services/adapter-manager/adapter-manager.js
• ghost/core/test/unit/server/services/adapter-manager/adapter-manager.test.js

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Walkthrough

This PR modifies the adapter manager's error detection logic to check only the first line of error messages when determining if a module loading failure is due to missing dependencies, avoiding false positives from Node.js's appended require stack traces. The implementation change in adapter-manager.js is accompanied by new test coverage that validates the behavior with a temporary adapter module that requires a non-existent package.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and accurately describes the main fix: correcting how the adapter-manager distinguishes between missing adapters and missing dependencies.
Description check	✅ Passed	The description is directly related to the changeset, explaining the root cause (require stack appearing in error message) and the solution (restricting check to first line).
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

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• Create PR with unit tests
• Commit unit tests in branch fix-adapter-missing-dep-error

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