[sweep] Duplicate prompt building pattern

**Finding:** `dry-001`

Same StringBuilder pattern for building prompts with pre-loaded context (context.md, standards, memory, AGENTS.md) appears in RunClaudeInteractive, RunClaudeInteractiveRefine, RunClaudeInteractivePersonas, RunClaudeInteractiveStandards, and RunStandardsInference

**Location:** cli/Program.cs:2326
**Severity:** medium

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*Generated by `mill sweep`*