Task: Quality configuration

Description

Extend the opencode config system to support quality monitoring settings. Add a quality section to Config.Info with all configurable options including scoring weights, regression thresholds, logging preferences, and database path.

Acceptance Criteria

• quality key added to Config.Info Zod schema in packages/opencode/src/config/config.ts
• All settings have sensible defaults (enabled: true, logging: true, logLevel: "normal", etc.)
• Weights sub-object: correctness (40), userFeedback (35), staticAnalysis (25)
• Regression sub-object: threshold (15), windowSize (20), alertLevel ("moderate")
• Paths configurable: dbPath (".opencode/quality.db"), logPath (".opencode/quality.log")
• retentionDays configurable (default: 90)
• Quality config accessible via Config.get() following existing patterns
• Config validates that weights sum to 100 (or normalizes them)
• Zod schemas exported for reuse in other quality modules

Technical Details

• Modify packages/opencode/src/config/config.ts — add quality to the Config.Info schema
• Use .optional() so existing configs without quality section continue to work
• Follow the pattern used by compaction and experimental config sections
• Export quality config type for use in packages/opencode/src/quality/ modules

Dependencies

• None — this is a foundation task

Effort Estimate

• Size: S
• Hours: 2-3
• Parallel: true