P1-FEATURE-010: Build Report — Stage-by-Stage Build Summary

Summary

Implement a comprehensive build report that summarizes the full model build pipeline stage-by-stage, including metrics, EP compatibility results, and optimization summary.

Context

Users and developers need visibility into what happened during wmk build — how long each stage took, what the graph optimizer changed, and which EP is compatible. This report also serves as an audit artifact.

From plans/release/0501_release_plan/P0_CHECKLIST.md (P1-FEATURE-010).

Current State

• wmk build produces console output but no structured report artifact
• No per-stage timing or graph metrics
• No EP compatibility analysis summary in build output

Desired State

• wmk build saves artifacts/build_report.json with:
  • Stage timing: export, analyze, optimize, quantize (ms each)
  • Graph metrics: node count before/after each stage, op type distribution
  • EP compatibility: per-EP compatibility score from static analyzer
  • Optimization summary: nodes added/removed per pass
  • Errors: any non-fatal warnings or skipped stages

Acceptance Criteria

• artifacts/build_report.json generated on every wmk build run
• Stage timing recorded for all pipeline stages
• Graph metrics: node count, op count by type, model size (MB) at each stage
• EP compatibility results included (from static analyzer output)
• Optimization summary: net node change, passes applied
• Human-readable summary printed to console at build completion
• Build report format documented
• All existing tests pass

Technical Notes

• Report schema: define a stable JSON schema (will be public API)
• Console summary: print a table of stages + timing + key metrics
• Must not break existing wmk build behavior — report is additive

Related Files

• plans/release/0501_release_plan/feature-scale.md — P1.10 Build Report
• plans/release/0501_release_plan/P0_CHECKLIST.md — P1-FEATURE-010