fix(snapshot): handle git add failures with --ignore-errors fallback

[yimingll]

Problem

When git add . fails during snapshot initialization (e.g., due to Windows reserved filenames like nul, con, aux, prn), the snapshot silently returns the empty tree hash (4b825dc642cb6eb9a060e54bf8d69288fbee4904).

This causes:

• All diff calculations to be based on empty tree
• undo command only reverts conversation, not code changes
• revert functionality completely non-functional
• No error message shown to user

Reproduction Steps

1. Create a file named nul in a project directory (Windows)
2. Start opencode and make code changes
3. Try to undo - conversation reverts but files remain unchanged

Log Evidence

INFO service=snapshot hash=4b825dc642cb6eb9a060e54bf8d69288fbee4904 cwd=E:\project git=...

The hash 4b825dc642cb6eb9a060e54bf8d69288fbee4904 is Git's well-known empty tree hash.

Solution

• Check git add exit code and log warnings on failure
• Retry with --ignore-errors flag to skip problematic files
• This allows snapshot tracking to work for all other files even when some files can't be added

Changes

• packages/opencode/src/snapshot/index.ts: Modified track() function to handle git add failures gracefully

Testing

Tested on Windows with a file named nul that previously broke snapshot initialization. After the fix, snapshot correctly tracks all other files and undo/revert works as expected.

[github-actions]

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[github-actions]

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