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Session handover — 2026-05-11

End-of-day pickup note. Today: Slice 4 of ADR-0005 (SDK auth swap) shipped, mostly complete with the throughput sub-issue deferred via explicit reopen contract. Two new known-patterns entries captured the diagnostic shape that produced the deferral. A pre-Slice-4 wiki numbering correction restored Slice 3 = transformer integration and Slice 4 = SDK swap as stable identifiers across four files. Working- with-claude-code protocol docs gained today's worked examples.

The session principle: when an architectural fix fails for a reason orthogonal to the hypothesis it was meant to test, re-diagnose before pivoting. And: a parameter sweep across the variable distinguishes hypotheses that a single point cannot. Both folded into known-patterns.md.

Where we ended up

  • Branch: master — all of today's edits in one commit (this one) per the user-set scope.
  • Worker deployed: unchanged (https://replatform-emdash-demo.cathaldempsey.workers.dev). Slice 3 (transformer integration) lands the Portable Text refs in D1 next session; until then, deployed CMS smoketest still renders broken images.
  • R2 bucket: replatform-emdash-media. The 158 wfpainters wrangler-era objects were backfilled with x-amz-meta-original-name via Slice 4's CopyObject + MetadataDirective: REPLACE pass. 158/158 verified.

Today's work — what shipped

Slice 4 of ADR-0005 — SDK auth swap (mostly complete)

apps/cms/scripts/upload-image.mjs swapped from wrangler shellout to @aws-sdk/client-s3 against R2's S3-compatible endpoint. Helper signature uploadImage(localPath, domain) → { logicalRef, key, alreadyExisted } unchanged across the swap. SDK config: explicit endpoint, R2 API token credentials sourced from apps/cms/.dev.vars (gitignored), default maxAttempts: 5 retry strategy handles 429/5xx.

Done criteria status: - (a) SDK swapped, helper signature unchanged ✓ - (b) x-amz-meta-original-name set on every PUT — verified Phase 5 on a fresh benchmark object ✓ - (c) Backfill of 158 wrangler-era wfpainters objects via apps/cms/scripts/backfill-original-name.mjs; full-corpus verification (list → headObject all → assert non-empty) is embedded and reusable for the eventual portfolio-wide run ✓ - (d) Validator green: 9/9 normaliser, 158/158 idempotency first and second pass, 3/3 pub URLs, /_image returns webp ✓ - (e1) PUT/sec floor — deferred (see "Throughput sub-issue" below) - (e2) <30 min projection — deferred

Throughput sub-issue. Phase 4 measured 43.3 PUT/sec at concurrency=50; sweep across [50, 100, 200, 500, 1000] showed flat ~50–70 PUT/sec regardless of concurrency. Curve shape → remote-imposed ceiling (likely per-token or per-account rate-limit on the S3 API). EC2 pre-stage confirmed reachable but not exercised. Closed as deferred per user direction; reopen-trigger contract written into known-issues.md.

Pre-Slice-4 wiki numbering correction

The session-start protocol's forced summary surfaced retroactive slice renumbering across four files (handover, ADR-0005 Slice tracker, known-issues entry, implementation-slice canonical example). Restored stable identifiers: Slice 3 = transformer integration (original); Slice 4 = SDK swap (new addition); execution order Slice 4 → Slice 3.

Decisions captured

decisions/0005-image-pipeline.md Slice tracker — Slices 1, 2, 4 done; Slice 3 next; throughput sub-issue noted with explicit deferral pointer to known-issues.md. ADR body and §1–§6 specs unchanged (append-mostly).

Known-patterns additions (two)

  • "Architectural fix fails for a reason orthogonal to the hypothesis — re-diagnose" (Slice 4's HTTP/2 attempt)
  • "Parameter sweep distinguishes hypotheses a single data point can't" (Slice 4's concurrency sweep)

Known-issues changes

  • Deleted: "R2 upload — wrangler-shellout baseline (auth swap pending)" — Slice 4 closed it.
  • Added: "R2 upload — throughput ceiling (deferred until 50-site end-to-end is proven)" — full curve data, hypothesis status, EC2 pre-stage state, strategic implication, reopen-trigger contract.
  • Updated: "CMS image migration pipeline (broken images in production)" — now reflects Slices 1, 2, 4 done; Slice 3 still outstanding.

Protocol docs

working-with-claude-code/implementation-slice.md: - Real-stop conditions list — added three Slice 4 examples (architectural-fix-fails-orthogonally, sweep-on-wrong-side-of- hard-target, strategic-deferral-as-real-stop close) - Canonical bottom example replaced: Slice 4 walkthrough with all real-stop episodes + the deferral close

working-with-claude-code/session-start.md: - New "Forced summary catches drift" section — the 2026-05-11 slice numbering story + detection rule (treat slice/ADR numbers as append-only)

working-with-claude-code/session-end.md: - New "Closing a slice as 'mostly complete' — deferral contract" section — the shape rule for slice-with-deferral close-out

CLAUDE.md — unchanged (still accurate as a skinny pointer).

Open items for tomorrow

1. Slice 3 of ADR-0005 — transformer integration (next priority)

Walk seed.json imageUrl refs through the now-SDK-backed uploadImage helper; rewrite to r2:<domain>/<key>; add originalName Portable Text sibling per ADR §6. Backfill the 11 already-seeded garvanbay pages.

The helper is fast enough for development and small-batch validation through 50 sites — that's the gate before any throughput architecture work happens. End-to-end first, throughput second.

2. Continue toward 50-site end-to-end gate

After Slice 3, drive the per-site seed flow + verify-design coverage across the next batch of sites. The 50-site gate is what closes the "is the pipeline real" question and is the precondition for revisiting throughput architecture.

3. Throughput architecture — held until the 50-site gate fires

See known-issues.md "R2 upload — throughput ceiling" for the explicit reopen contract. Held items pre-staged for that work: EC2 sweep (cathals-demo reachable, Node 22.22.0 installed), and multi-token sharding as the architectural answer if the EC2 sweep also returns flat at ~60 PUT/sec.

4. Carried over from prior sessions

  • Confirm copied-vs-shared packages/components-v3/ upstream relationship.
  • Re-think matcher-layer silent failure (apply loud-fail audit shape upward).
  • infra/llm-gateway/ workstream decision — sibling project that gets its own commit, or noise to clean up?
  • Custom domain for R2 assets (r2.dev is fine for migration; map pre-launch).

What's NOT yet done

  • Slice 3 (transformer integration) — the actual D1 rewrites haven't run; CMS smoketest still renders broken images.
  • Throughput target — see deferred sub-issue.
  • /contact static page — still uses pre-canonical hand-rolled fcr-blocks layout (carried).
  • emdash admin upload UX — operators hand-edit D1 via SQL; a real "upload through admin → R2 → DB" path is a separate workstream from the migration script (carried).
  • .gitignore update for .tmp/ paths — still showing in git status (carried; small).

Cross-references

  • decisions/0005-image-pipeline.md "Slice tracker" — Slices 1, 2, 4 done; Slice 3 next; throughput sub-issue pointer
  • known-patterns.md — two new entries: architectural-fix-fails- →-rediagnose; parameter-sweep-distinguishes-hypotheses
  • known-issues.md — "R2 upload — throughput ceiling" with reopen-trigger contract; "CMS image migration pipeline" updated; "R2 upload — wrangler-shellout baseline" deleted (resolved)
  • working-with-claude-code/{session-start,implementation-slice,session-end}.md — today's worked examples folded in
  • apps/cms/scripts/{upload-image.mjs, upload-image.validate.mjs, backfill-original-name.mjs} — the SDK path code; the backfill-with-verification is reusable for portfolio-wide
  • This commit — Slices 1, 2, 4 complete (throughput deferred); working-with-claude-code protocol docs.