fix(editor): treat missing write capability as editable

[bajrangCoder]

No description provided.

[greptile-apps]

Greptile Summary

This PR changes file-opening behavior so that only an explicit canWrite: false marks an editor as read-only.

• Filesystem providers that omit write-capability metadata now open files as editable.
• Explicitly non-writable files remain read-only.

Confidence Score: 5/5

The PR appears safe to merge, with no concrete blocking or non-blocking defects identified in the changed behavior.

Current filesystem providers supply boolean write-capability values, explicit false remains read-only, and no reachable provider path was established where the new missing-capability behavior incorrectly enables editing.

Important Files Changed

Filename	Overview
src/lib/openFile.js	Replaces a general falsy check with an explicit false comparison, preserving read-only behavior for declared non-writable files while treating absent capability metadata as editable.

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