PR Review Summary

Status: Approved

🪜 Strategic-Fit Decision

Per §9 Strategic-Fit Step-Back:

• Decision: Approve
• Rationale: Approve (not Approve+Follow-Up) because the diff is a complete, correct B3 cleanup matching ADR 0019 §3-B3 + the #12504 ticket exactly, CI is green, and there are no blocking defects. The one observation below is a non-blocking doc-precision note, better surfaced as a comment than as a merge-blocking Required Action.

Peer-Review Opening: Clean, well-scoped B3 leaf — thanks for keeping it to exactly the one live site and relocating the default to the owning leaf rather than just deleting the fallback. Cross-family review (Claude ↔ GPT) below.

🧭 Patch-Blind Premise Snapshot

• Inputs Read Before Patch: ADR 0019 (the AiConfig SSOT authority — B3 = defensive ?., [live-on-dev], sanctioned form §5.1 "no ?., let it fail loud" + §5.2 "leaves declarative, default in the leaf"); ticket #12504 + its Contract Ledger; epic #12461; the changed-file list; current dev source of ProtoSource.mjs + the sourcePaths leaf in config.template.mjs.
• Expected Solution Shape: (1) ProtoSource.mjs drops sourcePaths?.ProtoSource ?? 'proto' → direct aiConfig.sourcePaths.ProtoSource (fail-loud); (2) the proto default relocates into the owning config.template.mjs sourcePaths leaf as a concrete literal (not a consumer ??, resolver, or magic-string); (3) CustomSources.md teaches the direct pattern. Must NOT hardcode the default in the consumer. Test-isolation: example/template/doc → no unit test required, but the change must target the template (tracked canonical, not the gitignored overlay).
• Patch Verdict: Matches (and slightly improves). Evidence: ProtoSource.mjs:43 ?.…?? 'proto' → aiConfig.sourcePaths.ProtoSource; config.template.mjs adds ProtoSource: 'proto' as a concrete literal inside the sourcePaths: leaf({…}) block; CustomSources.md updates both the example and the Path-conventions guidance to the direct read. Improves: the JSDoc also drops a decay-prone Epic #11624 archaeology ref. V-B-A'd via gh pr diff + a fixed-string grep -rFn 'sourcePaths?.' ai/ confirming ProtoSource.mjs:43 was the sole literal defensive site on dev.

🕸️ Context & Graph Linking

• Target Epic / Issue ID: Resolves #12504
• Related Graph Nodes: #12461 (parent epic, B3 production-source cleanup), #12456 (workstream epic), ADR 0019 (authority), sourcePaths leaf, B3 antipattern

🔬 Depth Floor

Challenge (non-blocking, doc-precision): CustomSources.md's Path-conventions now states "Defaults belong in config.template.mjs, not in consumer-side optional chains." That is exactly right for built-in sources like ProtoSource (now a built-in default in neo's template). But CustomSources.md's primary audience is external tenants authoring their own custom sources — and their source's default cannot live in neo's config.template.mjs (they don't control it); it belongs in their own config.mjs overlay sourcePaths entry. The blanket phrasing could lead an external custom-source author to look for a template they can't edit. Non-blocking — the statement is true for the example in front of it; consider a one-line clarification distinguishing built-in default → template leaf from tenant custom default → operator overlay. Surfaced as a follow-up, not a merge blocker.

Rhetorical-Drift Audit (per guide §7.4):

• PR description: "remove ProtoSource defensive sourcePaths read" matches the diff exactly — no overshoot.
• Anchor & Echo summaries: the updated JSDoc/comments use precise terminology ("the config leaf owns the default"); no metaphor; a stale Epic #11624 anchor was removed (improvement).
• [RETROSPECTIVE] tag: N/A — none in the PR body.
• Linked anchors: ADR 0019 §3-B3 genuinely establishes the antipattern + sanctioned form the PR implements.

Findings: Pass. One non-blocking doc-precision observation above.

🧠 Graph Ingestion Notes

• [KB_GAP]: N/A — no framework concept misunderstood; the fix demonstrates correct ADR 0019 SSOT comprehension (resolved-leaf read, default in owning leaf, fail-loud).
• [TOOLING_GAP]: N/A.
• [RETROSPECTIVE]: Exemplary small B3 leaf — the value is disproportionate to size: removing the defensive ?. from an example (copied as a pattern) + fixing the teaching doc stops the antipattern propagating to future custom-source authors. Relocating the default to the owning leaf (not just deleting the fallback) is the substrate-correct half that an incomplete fix would miss.

🎯 Close-Target Audit

• Close-targets identified: Resolves #12504 (newline-isolated, PR body line 1); Refs #12461 (line 2).
• #12504 labels: enhancement, ai, refactoring, architecture — not epic. Valid leaf close-target.
• #12461 (epic) correctly referenced via Refs, not a closing keyword.
• Commit body: fix(ai): remove ProtoSource defensive sourcePaths read (#12504) — ticket ref only, no Closes/Fixes/stale Resolves.

Findings: Pass.

📑 Contract Completeness Audit

• Originating ticket #12504 contains a Contract Ledger matrix (single row: ProtoSource example source-path read).
• Implemented diff matches the ledger exactly: reads aiConfig.sourcePaths.ProtoSource directly (no optional-chain / consumer-default), fail-loud if SSOT missing, default declared in the owning leaf, JSDoc/comment stays aligned.

Findings: Pass — no contract drift.

🧪 Test-Execution & Location Audit

• Change scope: one example .mjs consumer read + one config.template.mjs concrete-literal default + one learn/ doc — documentation/template/example per guide §7.5.3.
• No new/moved test files; no test directory placement to verify.
• No related unit tests exist for this example; none are required for an example/template/doc change. AC3 ("no sourcePaths?. remain under ai/") verified statically via fixed-string grep instead of test execution.

Findings: No tests needed (example/template/doc change); AC3 confirmed statically.

🔗 Cross-Skill Integration Audit

• The PR's own doc update (CustomSources.md) is the cross-skill/pattern propagation — the canonical teaching surface for the example is updated in lockstep with the example.
• No new convention/MCP-tool/skill-file/startup-doc introduced; no predecessor step elsewhere needs to fire this (it's a scoped B3 cleanup leaf, not a new primitive).

Findings: All checks pass — the example and its teaching doc move together; no latent integration gap. (See the non-blocking doc-precision note in Depth Floor.)

N/A Audits — 🪜 📡

N/A across listed dimensions: no runtime-unreachable ACs (static example/template/doc change → no Evidence-ladder collapse risk); no ai/mcp/server/*/openapi.yaml tool-description surface touched.

📋 Required Actions

No required actions — eligible for human merge.

(The Depth-Floor doc-precision observation is an optional follow-up for the author's discretion, not a merge blocker.)

📊 Evaluation Metrics

• [ARCH_ALIGNMENT]: 100 — Textbook ADR 0019 §3-B3 fix: resolved-leaf read at the use site, default relocated to the owning template leaf, fail-loud, teaching doc corrected. I actively considered (a) default-in-the-right-layer (yes — template leaf, not consumer), (b) any residual alias/re-derive/?./threading (none), (c) whether the antipattern is still taught anywhere (no — the doc was fixed) and confirmed none apply.
• [CONTENT_COMPLETENESS]: 100 — Consumer comment + doc Path-conventions both updated to match the new shape; PR body is a complete Fat-Ticket with ledger mirror; a stale Epic #11624 JSDoc anchor was additionally removed. I considered missing-JSDoc, stale-comment-left-behind, and Fat-Ticket completeness and confirmed none apply.
• [EXECUTION_QUALITY]: 95 — 5 points reflect that the example's correctness now couples to the resolved template version (an external workspace pinning a pre-this-template neo.mjs would fail-loud on the missing default) — this is the intended B3 fail-loud behavior, non-blocking, not a functional defect. No tests required (example/template/doc).
• [PRODUCTIVITY]: 100 — All four #12504 ACs met: AC1 no ?./?? 'proto', AC2 reads the resolved leaf, AC3 V-B-A-confirmed sole site removed (no residual sourcePaths?. under ai/), AC4 cites ADR 0019 + links #12461.
• [IMPACT]: 40 — Routine B3 cleanup leaf: one example read + one template default + one doc. Modest propagation value (example-as-pattern + teaching-doc correction) above a trivial tweak, below a substantive refactor.
• [COMPLEXITY]: 15 — Low: 3-file change (+7/−7); one consumer read, one template literal, doc prose; no new code paths, no cross-substrate integration.
• [EFFORT_PROFILE]: Quick Win — high clarity/teaching ROI (stops antipattern propagation through an example + doc) at minimal complexity.

Approved — eligible for @tobiu's human merge. Nice tight B3 leaf.