Determine if feature exists or needs build

BEFORE building any feature/module; avoids reimplementing existing code or merging dead branches

• · feature description (natural language string or JSON args)
• · graph MCP queries (semantic_search_nodes, callers_of, tests_for)
• · git history (log --grep, pickaxe, branch scans)
• · HIVEMIND memory (prior decisions, gotchas)

• · verdict block: {status: exists|partial|missing, evidence, wired, reuse_or_gap}
• · lane findings per recon approach (graph, git, memory)
• · exact delta to build OR symbols to reuse/extend

• · agent (3 parallel lanes: graph, git, memory)
• · code-review-graph MCP (semantic_search_nodes, callers_of, get_architecture_overview)
• · git commands (log --grep, pickaxe)
• · HIVEMIND MCP (recall, recall_bugs)

• · code-review-graph MCP populated (codebase indexed)
• · HIVEMIND MCP available for prior decisions
• · git history accessible

• · graph/memory gives false negatives (feature exists but not found)
• · git history misses branch-only implementations
• · ambiguous feature description (multiple interpretations)
• · reuse opportunity missed due to naming drift

• · 3-lane parallel recon: graph, git, memory (catches different artifact types)
• · Graph lane checks wired vs dead (callers_of tests)
• · Git lane finds reverted/branch-only implementations
• · Memory lane surfaces prior gotchas and decisions
• · Final verdict synthesizes lanes with evidence + confidence