feat: remove semantic indexing experimental gate

[marius-kilocode]

Semantic indexing is hidden behind experimental.semantic_indexing even though indexing already has explicit global and project opt-in controls. This adds a redundant configuration step and prevents users from accessing indexing settings until a separate flag is enabled.

Expose semantic indexing settings and CLI controls whenever the indexing plugin is available, and retire the experimental configuration key. Indexing still remains disabled until it is explicitly enabled globally or for a project, and existing configurations containing the retired flag continue to load without changing indexing enablement. semantic_search remains gated by an enabled and initialized index.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

The change is coherent and correctly implemented end-to-end. Key observations:

• Backward compatibility is properly handled: KilocodeConfig.retireIndexingFlag() strips the retired experimental.semantic_indexing key at config-load time and emits a warning, so existing configs continue to load without error or changed behaviour.
• Gate removal in indexing.ts boot() and indexing-feature.ts indexingEnabled() is correct — the plugin-presence check is the right remaining gate, and the actual enablement is still governed by indexing.enabled further down the boot path.
• configFeatures() in both packages/kilo-vscode/src/features.ts and webview-ui/src/stories/StoryProviders.tsx are kept in sync.
• Tests cover the retirement path (config.test.ts), the new enabled/disabled scenarios (indexing-startup.test.ts, indexing-feature.test.ts), and the VSCode feature-detection helper (indexing-utils.test.ts).
• Changeset is present and user-facing.
• i18n keys for the removed toggle are cleaned up across all 17 locale files.

New commit (9653833697): Fixed a race condition in indexing-startup.test.ts — the "stays disabled" test now correctly uses the wait() polling helper to await the Disabled state instead of reading it immediately, matching the pattern used throughout the rest of the test file.

Files Reviewed (31 files)

• .changeset/visible-semantic-indexing.md
• packages/kilo-docs/pages/customize/context/codebase-indexing.md
• packages/kilo-vscode/src/features.ts
• packages/kilo-vscode/tests/unit/indexing-utils.test.ts
• packages/kilo-vscode/webview-ui/src/components/settings/ExperimentalTab.tsx
• packages/kilo-vscode/webview-ui/src/i18n/ar.ts (and 15 other locale files)
• packages/kilo-vscode/webview-ui/src/stories/StoryProviders.tsx
• packages/kilo-vscode/webview-ui/src/stories/settings.stories.tsx
• packages/kilo-vscode/webview-ui/src/types/messages/config.ts
• packages/opencode/src/config/config.ts
• packages/opencode/src/kilocode/config/config.ts
• packages/opencode/src/kilocode/indexing-feature.ts
• packages/opencode/src/kilocode/indexing.ts
• packages/opencode/test/kilocode/config/config.test.ts
• packages/opencode/test/kilocode/indexing-feature.test.ts
• packages/opencode/test/kilocode/indexing-startup.test.ts (updated: race condition fix)
• packages/opencode/test/kilocode/indexing-worktree.test.ts
• packages/sdk/js/src/v2/gen/types.gen.ts
• packages/sdk/openapi.json

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_{Reviewed by claude-4.6-sonnet-20260217 · 226,580 tokens}

_{Review guidance: REVIEW.md from base branch main}