fix(config): preserve permission order with Effect decode

[kitlangton]

Summary

• Decode loaded Config.Info with Effect Schema using propertyOrder: \"original\" so permission config precedence preserves user key order.
• Move agent config normalization to Effect Schema and remove the permission-specific Zod override.
• Replace remaining Config.Info Zod-only schema islands with Effect schemas while keeping .zod compatibility exports.

Tests

• bun typecheck from packages/opencode
• bun run test:ci test/config/config.test.ts test/config/agent-color.test.ts test/config/markdown.test.ts test/config/tui.test.ts test/permission/next.test.ts from packages/opencode

Notes

• Full bun run test:ci was attempted and hit an existing provider test timeout; rerunning test/provider/provider.test.ts alone also timed out on a different provider test.