board: post-merge arc + state entries for #880 — and record the arc gap for #862/#875/#876/#879

[AdaWorldAPI]

Summary

Post-merge board hygiene for #880 (merged 6bc9115), written immediately on merge rather than as later cleanup — the delay is the anti-pattern PR_ARC_INVENTORY.md's own 2026-07-27 recovery note documents.

Two files, both append-only prepends:

• PR_ARC_INVENTORY.md — the plan: kanban-64k-inverted-awareness v1 — parallel thinking + the inverted-awareness witness #880 entry: Added (plan / board / the doc-header honesty pass) · Locked (pre-registered W2 parallelism thresholds; dichotomous-statistics naming discipline; reliability ≠ validity; the HashMap fleet as a deliberate order-free keyed store ordered by temporal.rs at read) · Withdrawn (MailboxFleet-over-the-registry, with the structural reason verified against cycle_driver.rs:183-190) · Deferred · Review (three external rounds, every finding verified against source before acting) · Process · Confidence.
• LATEST_STATE.md — the matching narrative entry, including what is now pinned before any measurement and what is explicitly still open.

The finding this PR also records

The arc's memory practice broke again. There is no PR_ARC_INVENTORY entry for #862, #875, #876, or #879 — all merged 2026-07-29 → 2026-08-02. This is the same failure the file documents for #851–#856.

This PR does not reconstruct those entries. It records the gap at the top of the arc so it is visible instead of silent, which is precisely what the previous post-mortem identified as the thing that let six PRs slip unnoticed. Reconstruction — forensic method: merged diffs, commit messages, PR bodies, the review record, never inference — is queued as follow-up work.

The session writing this entry drove #875 and #876 itself and wrote no entry at the time. That is stated in the entry rather than omitted.

Self-caught correction (06e8818)

The first draft credited #570 with the MedcareBridge → UnifiedBridge<HealthcarePort> collapse. Re-reading the bridge's own doc-comment against that claim: #570 collapsed the OpenProject/Redmine ports and explicitly deferred the Healthcare one "until Healthcare gets promoted into the codebook" — that collapse landed later, in a PR the doc-comment does not name. Corrected to describe the pattern accurately and to state that the specific PR is unverified rather than guess a number. A wrong citation in an append-only arc is worse than an acknowledged gap.

Two things carried forward as named open work

• ConsumerActor<P: PortSpec> — would re-derive the unwired stub actor as a one-line type alias; the actor-half of the same bridge collapse.
• soa_bake ownership — whether its scaffolded half stays a bake or becomes a loader, now that OGAR ships complete bakes emitting NodeRow bytes.

Test plan

Board-file-only change; no code, no behaviour. Both files follow the append-only rule (prepend; no past entry edited).

🤖 Generated with Claude Code

https://claude.ai/code/session_01K3RyLEbuNSHxxB3NTTrGki

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