Fix: Config Get returns stale data after Patch

[Liyw979]

• Change config file path from config.json to opencode.json to match the auto-loader which reads from .opencode/opencode.json
• Add invalidate() call to clear config cache after writing, ensuring subsequent Config.get() calls return updated data

Issue for this PR

Closes #

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

Description

After calling the patch /config endpoint to add a custom agent configuration, immediately reading from the /configreturned stale data without the newly patched agent configuration.

What does this PR do?

This PR fixes a configuration caching issue where Config.get() returns stale data after calling Config.update(). The fix ensures that:

1. Updates are written to the correct file (opencode.json not config.json) that the auto-loader reads
2. The config cache is cleared after writing, so subsequent reads reflect the updated configuration

How did you verify your code works?

I added a failing test case

Screenshots / recordings

If this is a UI change, please include a screenshot or recording.

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[github-actions]

This PR doesn't fully meet our contributing guidelines and PR template.

What needs to be fixed:

• No issue referenced. Please add Closes #<number> linking to the relevant issue.

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[github-actions]

Hey! Your PR title Fix: Config Get returns stale data after Patch doesn't follow conventional commit format.

Please update it to start with one of:

• feat: or feat(scope): new feature
• fix: or fix(scope): bug fix
• docs: or docs(scope): documentation changes
• chore: or chore(scope): maintenance tasks
• refactor: or refactor(scope): code refactoring
• test: or test(scope): adding or updating tests

Where scope is the package name (e.g., app, desktop, opencode).

See CONTRIBUTING.md for details.

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Based on the search results, I found one potentially related PR:

Related PR:

• fix: resolve config file read/write mismatch in update endpoint #15045 - "fix: resolve config file read/write mismatch in update endpoint"
  • This appears to be addressing a similar issue with config file read/write mismatches in the update endpoint, which relates to the core problem being fixed in PR Fix: Config Get returns stale data after Patch #20636.

The other results are not relevant duplicates - PR #14743 is about Anthropic prompt caching (unrelated) and PR #20316 is about sandboxing configuration (different feature).

[github-actions]

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