Changes touching this path

• the browser SDK reads a relay at the heads generation and refuses a host that cannot give it one: connectRelay list() and read() open with a fetch carrying depth one, the heads nodes and nothing older with the whole manifest on each, and the object round is bounded the same way rather than paying the history a second time, since a want is answered by address across the cut, so a read is two bounded rounds where it was one unbounded and one that repeated it, against the 53 MB per call the map measured on this repo; the host is asked once per repo, on GET /info, which the transport seam gains as an optional get so a lane that never asks stays honest, and a host whose answer does not say fetch_depth, or answers with a non-2xx, or not JSON, or through a transport with no get, is read as one that did not say and is refused as a SetupError naming the host and the version line it reported, before any bytes are asked for, unless the caller passed unboundedRead, which accepts the cost on that host and asks a capable one for the bound all the same; a probe that could not reach the host is a TransportError and is asked again next time. heads() names the set the bounded read answered with, on a RelayLootRepo the connect door now returns, and several heads fold as they did, a later head write winning a shared path; push, status and grant ride the same bounded round because the parents a change builds on and the tree it carries are the heads own, which is all they ever read. pinned on a fake transport with the golden bundles, the request bytes bounded on the metadata and the object rounds, the old host refused by name on list and on read with nothing posted, the opt-in against it and not against a capable host, the probe asked once across list and read, the three did-not-say shapes each refused and each opted into, the unreachable probe re-asked, and heads() one; and over a spawned relay with two generations, the request four bytes longer than the unbounded one ending in one, the answer one node whose parent is the base change a whole fetch shows, every round of a read one node, the head named and then two after a fork the second session pushes off a replayed metadata answer, listed as the union, and the field stripped off the real /info refused by name and paid for on opt-in. README states the cost and the option, CONTEXT and ADR 0089 say the browser SDK refuses rather than is to. red under mutation, counts read each time: the depth never sent (21 passed and 5 failed), every host assumed to cut (21 passed and 5 failed), unboundedRead ignored (22 passed and 4 failed), the probe asked on every read (18 passed and 1 failed), a failed probe remembered (17 passed and 2 failed), heads() naming nothing (23 passed and 3 failed), the refusal not naming the host (24 passed and 2 failed), a transport without get reading as capable (18 passed and 1 failed), a 404 on /info reading as capable (18 passed and 1 failed), an error on /info remembered as a refusal (18 passed and 1 failed), an explicit false read as absent (18 passed and 1 failed), a JSON non-object left unclassified (18 passed and 1 failed), the head derivation skipping the parented filter (6 passed and 1 failed), and the object round unbounded (24 passed and 2 failed). no rust, no migration, no wire or format byte moves, and no host behaviour moves, so this owes no deploy beyond the one #2123 already owes the release; the SDK suite is green in the lane (126 passed over 11 files, against release binaries and sdk/wasm built in the lane) and the workspace suite is untouched by a TypeScript change and was green at the base (4017 passed over 126 binaries, 7 ignored, at 5a007435) (#2124) 8eb8e8cd · dbf3dbe6…

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