docs(changelog): M90_002 — terminal gate writes, strand recovery, loss-proof webhooks

[indykish]

Changelog entry for M90_002 (usezombie PR #394). Jun 11, 2026.

Leads with the user-facing change: events refused by a lease gate now end in a visible gate_blocked row with a named failure_label instead of stranding silently; stranded deliveries recover; webhook enqueue failures stay deliverable on retry. API: steering a paused zombie returns 409 UZ-ZMB-012 with current_state; paused webhooks return 200 {"ignored":"zombie_paused"} (UZ-WH-003 retired).

Voice: one headline, no marketing words, **Bold lead-noun** bullets, error codes + endpoints kept verbatim. History append-only (new entry above the Jun 11 egress entry, same date).

🤖 Generated with Claude Code

Greptile Summary

Adds the M90_002 changelog entry documenting terminal gate writes, strand recovery, and loss-proof webhooks. The new <Update> block is placed correctly above the other Jun 11 entries; terminology ("agent", "activity stream") and section order (What's new → API reference → Bug fixes) are all correct after the prior-round fixes.

• Missing \"What's new\" tag — the tags array reads [\"Bug fixes\", \"API\"] but the block opens with a ## What's new section; every comparable entry includes \"What's new\" in its tags.
• Content is accurate — error codes, endpoint paths, field names (gate_blocked, failure_label, zombie_paused, UZ-ZMB-012, UZ-WH-003), and prose all match the PR description without introducing forbidden terminology.

Confidence Score: 4/5

Safe to merge after adding "What's new" to the tags array — the content itself is correct and well-formed.

The only defect is the tags array on the new <Update> block omitting "What's new" while the block itself opens with a ## What's new section. This causes the entry to be invisible to readers filtering the changelog by that tag. One-word fix; nothing else is wrong with the entry.

changelog.mdx — the tags attribute on the new Update block at line 25.

Important Files Changed

Filename	Overview
changelog.mdx	New M90_002 Update block added above the Jun 11 egress entry; terminology and section order are correct, but the tags array omits "What's new" despite the block containing a ## What's new section.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Webhook event received] --> B{Idempotency check}
    B -- Genuine duplicate --> C[Deduped — no action]
    B -- New event --> D{Enqueue to runner queue}
    D -- Transient failure --> E[Slot NOT consumed\nSender retry delivers normally]
    D -- Success --> F{Lease gate evaluation}
    F -- Credential missing --> G[terminal: gate_blocked\nfailure_label: secret_missing]
    F -- Approval denied/expired --> H[terminal: gate_blocked\nfailure_label: approval_denied / approval_expired]
    F -- Balance exhausted --> I[terminal: gate_blocked\nfailure_label: balance_exhausted]
    F -- Gate passed --> J{Runner alive?}
    J -- Runner retired/crashed --> K[Reclaim & re-lease\nStranded delivery recovers]
    K --> F
    J -- Runner healthy --> L[Run executes normally]

    M[POST /zombies/id/messages\nto paused agent] --> N[409 UZ-ZMB-012\nwith current_state + resume hint]
    O[Webhook to paused agent] --> P[200 ignored: zombie_paused\nIdempotency slot preserved]

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_{Reviews (3): Last reviewed commit: "Merge remote-tracking branch 'origin/mai..." | Re-trigger Greptile}

Context used:

• Context used - AGENTS.md (source)

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