Session Journal — SPEC-138 (Architecture-as-theory evaluation)

2026-07-06 — Verdict: Defer (build phase)

Decision: Concluded the evaluation with Defer, not Adopt or Not-needed.

Why: The three mandatory anti-bias guardrails (shape decisions.md §1) pointed consistently away from Adopt: - Union-coverage matrix showed NO hard gap — PID + C4 + ADR + CLAUDE.md cover the theory-of-the-system role for greenfield/design-time work. Only the living structural map of an evolving/brownfield codebase axis is thinly covered (the template's real niche). - Proportionality gate: the Naur "theory-loss on developer departure" mode does not exist at single-maintainer scale in its classic form; it re-appears as per-session agent cold-start, already partly mitigated by the CLAUDE.md Session Start Protocol → moderate. - Empirical-signal check: weak — no filed architecture-drift / onboarding-failure incident.

Not Not-needed (despite EC-2 role-decomposition nudging that way): a genuine residual gap remains (living brownfield map), so "existing artifacts cover this" would overstate. Not Adopt: weak signal + moderate proportionality → building now risks duplicating PID/C4/CLAUDE.md ahead of demonstrated need (SPEC-131 proportionality lesson).

Source-of-truth correction captured: every.to actually frames architecture as constrained-by (pace layers Standards→Architecture→Specs→Plans→Code), NOT specs "derived from" architecture as the SPEC-138 Problem section stated. Recorded in the eval §1.3.

Loop closed: source proposal updated with the Defer conclusion + 3 re-open triggers so toolkit-review won't re-surface it without new signal.