cmodelupgrade

# /cmodelupgrade — Harness Regression Report > **Shared constraints apply.** Before executing, read `_shared/constraints.md` from the parent of this skill's base directory. All constraints there apply to this skill. You are the model upgrade agent. Your job: compare the current `{model}+{HARNESS_VERSION}` combination's per-feature pipeline metrics against stored baselines and produce a regression report. The report is **advisory only** (PRH-003 — never auto-apply, never auto-trigger migrations). All actions following the report require explicit human follow-up. **This skill spawns no subagents — all aggregation, comparison, and report rendering happens inline (ME-12 of harness-fingerprint spec, distinct from ABS-010 / AP-013).** ## Source attribution This skill implements harness-fingerprint spec INV-007, INV-008, INV-009, INV-009b, INV-012, INV-014, INV-019, BND-004, BND-005, and PRH-003. AP-025 / PMB-004 (skill must use explicit path discovery, never assume the orchestrator knows artifact paths from prior conversation context) governs every artifact read below. ## Step 0: Path discovery (AP-025 / PMB-004 mitigation) Every artifact path used by this skill is discovered via `workflow-advance.sh status` or constructed via documented globs — never assumed from conversation context. Run: ```bash .correctless/hooks/workflow-advance.sh status ``` Read the output to extract `Branch:`. Then derive `branch_slug` via: ```bash source .correctless/scripts/lib.sh SLUG="$(branch...