Specification

Phase 0 second-reader pass — 2026-05-09

This file records a structured second read of the Phase 0 normative corpus, per REVIEW-CHECKLIST.md §7 (“second reader has skimmed 01–05 (or issues logged)”).

Who / what

Reader: engineering pass in-repo (spec + checklist + ADRs + compiler/, runtime/, verification/ layout), not an independent external domain expert.
If your governance requires a named human reviewer: treat this document as issue logging only; add a separate sign-off from that person.

Scope read

Artifact	Depth
`README.md` (this directory)	Full
`REVIEW-CHECKLIST.md`	Full
`01-type-system-foundation.md`	§1–2, §6–10 skim; open issues / decisions tables
`02-core-operations-and-typing.md`	§1–3, §8–19; decisions table; full op inventory spot-check
`03-subtyping-and-coercion.md`	§1–4, closing preview / open issues
`04-operational-semantics.md`	§1–3, soundness statement skim, §10 preview
`05-implementation-infrastructure.md`	§2–3, §8–10, exit criteria §9
`../decisions/phase-0-reference-implementation-status.md`	Full (implementation boundary)

No blocking contradiction was found between §01–§05, REVIEW-CHECKLIST.md §2–§3, and the reference-implementation ADR + §02 §19 / §05 §8.3 notes.

Findings

Resolved in this pass (docs only)

README.md — exit criteria blurb still listed “CI green” as unconditional among the six objective criteria. Host CI is deferred (billing); REVIEW-CHECKLIST.md §4 #6 already records that. Change: README.md now points to the checklist for CI vs local gates.
README.md — “no working compiler” read as if compiler/ could not exist before Phase 1. Change: clarified that a partial reference implementation may exist; Phase 1 remains the home of the full stack; pointer to §02 §19 and the ADR.

Low severity (no edit required unless you want polish)

05 §8.5 names Spec/Soundness.lean; the repo uses verification/Spec/Soundness.lean under Lake — consistent in spirit; path is relative to the verification project root as intended.
Cross-links from phase-0/*.md to ../decisions/ resolve from the repo layout used in GitHub / local clones.

Recommendations (not done here)

When CI is affordable again, add .github/workflows and narrow this log with a pointer to the first green workflow run.
If a human second reader reviews later, append a short subsection here or add second-reader-pass-<date>.md with their name and any deltas.

Checklist mapping

REVIEW-CHECKLIST.md §7 — second reader: satisfied via this logged pass (see “Who / what” above for limits).
REVIEW-CHECKLIST.md §7 — exit criteria §4: satisfied via explicit deferrals (CI / billing) and decisions/phase-0-reference-implementation-status.md for implementation vs §02 gaps.

End of second-reader pass record.