fix: preserve explicit model capability overrides

[hedssaz]

Summary

• Preserve user-edited model capabilities only when the model is explicitly marked with capabilitiesOverride
• Preserve user-edited context window and max output token limits only when explicit numeric overrides are set
• Keep registry metadata as the default source for capabilities, context window, and max output
• Avoid writing registry-enriched display models back into provider settings during add/edit/delete/fetch flows
• Add shared and renderer registry enrichment tests with fixed fixtures
• Document the override precedence

Notes

This is a forward-looking fix. Existing saved model configs that already contain capabilities, context window, or max output values but do not have explicit override flags will continue to follow registry defaults until the user edits them again. This avoids treating every saved registry-enriched model list as a permanent override.

Clearing a manual context window or max output value removes that override and returns the model to registry defaults when registry metadata exists.

Tests

• node node_modules/vitest/vitest.mjs run src/shared/model-registry/enrich.test.ts src/renderer/packages/model-registry/enrich.test.ts src/renderer/packages/model-registry/index.test.ts src/renderer/packages/model-registry/fetch.test.ts src/shared/providers/index.contract.test.ts
• node node_modules/@biomejs/biome/bin/biome check docs/technical/ai-providers.md src/renderer/modals/ModelEdit.tsx src/renderer/packages/model-registry/enrich.ts src/renderer/packages/model-registry/enrich.test.ts src/renderer/routes/settings/provider/$providerId.tsx src/shared/model-registry/enrich.ts src/shared/model-registry/enrich.test.ts src/shared/providers/index.ts src/shared/types/settings.ts
• /Users/hedssaz/.cache/codex-runtimes/codex-primary-runtime/dependencies/node/bin/node node_modules/electron-vite/bin/electron-vite.js build

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