[valentinyanakiev]

What changed

A test-only follow-up to #918 (merged as #931). The tracker's knows (crates/brokkr-protocol/src/process/attempts.rs:309-317) decides whether the registry already knows an identity. Most of its arms were reached only by process-driven ticks, whose timing decides whether an identity is met through a closed attempt's sets. So the exact-coverage gate could miss one under load on any PR:

• the merge queue's run for protocol: an idle run driver walks its own tree to detect, and one full snapshot attributes (#918) #931 missed live.open (:316), which protocol: an idle run driver walks its own tree to detect, and one full snapshot attributes (#918) #931's last commit pinned;
• landing 431L3's host coverage on main c3e52bd missed live.before.contains(id) (:313).

the_registry_knows_each_identity_by_the_set_that_holds_it asks knows directly:

• the engine itself, an unowned identity, and a closed attempt's before, recorded and doubted identities are each known;
• an identity that no set holds is unknown.

Together with only_an_open_attempt_knows_its_group_by_its_bare_pid, cargo llvm-cov --branch over these two tests alone covers both arms of every condition in knows.

How it's held

• Removal control: live.before.contains(id) replaced by false fails the test by name ("before was not known").
• Gates: fmt, clippy, and brokkr-protocol lib process::attempts (23).
• No production line, contract or public API changes.

Rulings asked (ruled 2026-11-01: the by-hand label)

1. How this test-only PR is vouched: the operator's by-hand label, or a landing run. Recommended: the by-hand label, as ruled for protocol: an idle run driver walks its own tree to detect, and one full snapshot attributes (#918) #931's and bundle: a bundle's identity stops at its own files, and its bound holds on every read (#908) #934's test-only coverage commits. It has no run of its own (the controller wrote it), so the contribution gate has no Brokkr-Run to read.

Ruling: operator 2026-11-01, in chat, "go with recommended" (#918, #918 (comment)): the by-hand label for this test-only follow-up

Part of #918's follow-ups. Part of #330.

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