Census approval: wake-latency-3

Ruling census-ruling-wake-latency-3. Every change below keeps the disposition it already has, so it needs an approval, not a decision.

| unit | change | read sites | what changed | |---|---|---|---| | internal/host/buildstate.go buildStates.write | body | unchanged (1) | its first try goes on the copy this agent last wrote at that key, conditioned on that copy's etag (one round trip); a conflict, an error, or a merge that refuses or has nothing to write on the copy is decided on a fresh read as before; no read added (the fresh read is the one it always made) |

Envelopes re-pinned: internal/appconfig, internal/host, internal/lease.

Seal: 86570d1326baad6d866b4066b6bf65218434b201fb1f2c05ebc6e3c79f9c5a98 → 86570d1326baad6d866b4066b6bf65218434b201fb1f2c05ebc6e3c79f9c5a98.

Overlay: internal/provision/testdata/plan14-root-reads-wake-latency-3.tsv, appended to internal/provision/testdata/plan14-root-reads-chain.tsv.