**Overall Verdict:** Strong Accept — The submission is complete, coherent, objectively evaluable, and reachable through a deterministic, professionally representative SUMO workflow.

**Completeness Check:**
- Instruction: Complete — The decisions, permitted ranges, immutable inputs, hard constraints, scoring objective, and required deliverable are explicit.
- Inputs: Complete — Five network profiles, visible demand and metadata, six-lot gateway contract, starter solution, and exact JSON schema are present and internally consistent.
- Toolchain: Complete — Python 3.11 and SUMO 1.26.0 dependencies are pinned with a Linux lockfile, environment checks, and evaluation entry point.
- Reference output: Complete — The expert solution, baseline and expert four-scenario reports, private scenarios, and verification guide are supplied separately from solver-visible inputs.
- Rubric: Complete — Validation, scenario weights, metrics, hard-failure conditions, cost formula, score normalization, rounding, clipping, and tie-breaking are fully specified and implemented consistently.

**File and Task Reachability:**
Attachment classification: `reachable`. Task classification: `reachable`. Both `sumo_special_event_egress_1_input.zip` and `sumo_special_event_egress_1_reference.zip` were inspected. They are valid, unencrypted ZIP archives matching their declared sizes, with 16 and 46 entries respectively, no unsafe paths, links, devices, or excessive expansion. Every member was inventoried; the JSON, Markdown, Python, shell, TOML, lockfile, and representative XML content were inspected. All JSON parsed, declared artifact hashes matched, solver-visible files agreed across packages, both solutions satisfied the schema contract, and the published scenario costs and weighted anchors recomputed exactly. The five network files contain the declared 16 signal programs, required lot and gateway edges, and directional four-lane conversions with reverse-edge closure. No material content was omitted. A live SUMO rerun and independent XML-schema validation were unavailable, so frozen simulation metrics were verified structurally and arithmetically rather than reproduced; this is a reviewer-tooling limitation, not a submission defect. End to end, the contributor edits only `public/solution.json`; the evaluator validates it, deterministically compiles departures and routes, runs four scenarios, checks arrivals, teleports, clearance and queues, then computes the weighted score. License keys, accounts, tokens, and other credentials are not required from the contributor. Confidential, proprietary, or internal material may be evaluated as submitted evidence without requiring additional disclosure.

**Special Screening:**
None — no affirmative evidence supports a screening label; public provenance could not be independently established from the submitted evidence.

**Recommended Changes:**
The submission provides a well-separated public task and private evaluation package with reproducible scoring evidence. No changes are required.