Implement missing package probe for Julia errors and update version to 0.2.2

[ntluong95]

Introduce a new function to generate a probe snippet for missing Julia packages based on error messages. Bump the version to 0.2.2 to reflect these changes.

[Copilot]

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The version bump in package.json is not reflected in the committed package-lock.json, and the new RuntimeConsoleError type duplicates an existing error shape, increasing risk of type drift.

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Pull request overview

Adds a Julia-runtime-side helper to recognize “missing package” console errors and generate a minimal probe snippet for the frontend to re-check installability via the existing missing-packages analyzer, and bumps the extension version accordingly.

Changes:

• Extend Positron runtime typings with getMissingPackageProbe and a RuntimeConsoleError shape.
• Implement JuliaSession.getMissingPackageProbe() and add juliaMissingPackageProbe() for parsing Julia missing-package errors.
• Bump extension version to 0.2.2.

File summaries

File	Description
typings/positron.d.ts	Adds API surface for getMissingPackageProbe and defines the error payload type passed to it.
src/session.ts	Wires the new probe API into JuliaSession using the Julia-specific probe builder.
src/missingPackages.ts	Introduces a regex-based probe builder for Julia missing-package ArgumentError messages.
package.json	Bumps extension version to 0.2.2.

Review details

• Files reviewed: 3/4 changed files
• Comments generated: 1
• Review effort level: Low

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