feat(config): deduplicate plugins by name with priority-based resolution

[devxoul]

Summary

• Deduplicate plugins by name so that when the same plugin is loaded from multiple sources, only the highest priority one is used

Problem

Previously, if the same plugin existed in both opencode.json and .opencode/plugin/ directory, both would be loaded.

• Example: [email protected] (npm) + oh-my-opencode.js (local) → both executed

Solution

• getPluginName: Extract canonical name from plugin specifier (supports file:// URLs, npm packages, scoped packages)
• deduplicatePlugins: Deduplicate by name, later entries (higher priority) win

Priority (highest to lowest)

1. Local plugin/ directory
2. Local opencode.json
3. Global plugin/ directory
4. Global opencode.json

Tests

• Unit tests for getPluginName (file URLs, npm packages, scoped packages)
• Unit tests for deduplicatePlugins (priority resolution, order preservation)
• Integration test for local plugin overriding global config

[devxoul]

@rekram1-node Thanks for the review. I updated some implementation. Feel free to check when you're available!

[devxoul]

Just rebased the latest dev branch and resolved conflicts.

[junhoyeo]

this pr is genius

[github-actions[bot]]

Thanks for your contribution!

This PR doesn't have a linked issue. All PRs must reference an existing issue.

Please:

1. Open an issue describing the bug/feature (if one doesn't exist)
2. Add Fixes #<number> or Closes #<number> to this PR description

See CONTRIBUTING.md for details.

[devxoul]

Fixes #7427

[rekram1-node]

/review

[github-actions[bot]]

lgtm

[rekram1-node]

can u rebase this? looks like a bunch of random commits got picked up

[devxoul]

can u rebase this? looks like a bunch of random commits got picked up

sure thing, just rebased @rekram1-node

[rekram1-node]

/review

[github-actions[bot]]

lgtm