Changes touching this path

• propose::list reads the tip authors its gate needs in one proposal_tip_authors read, taken only when a row cannot be answered without one, where it read change once per row; the read is scoped by the repo proposal rows rather than repo_change, since a tip is held to change_node alone and the Postgres key-arm pin in tests/proposal_read.rs went red on the repo_change join first tried. ingest asks propose::landed_by_declaration, the one landed closure run over the stored graph overlaid with the push, where it carried a second walk of its own, and a new conformance case hands the ingest transaction a decision that disagrees with the graph both ways and holds both stores to applying it and deriving nothing. counted rather than timed through a new call-logging store double, calls.rs: a listing makes the same reads at 1 row as at 40, a push makes the same reads at 1 open proposal as at 40 with the proposal rows and the graph each read once and the transaction last, and a push with no open proposal reads no graph; a push that lands a proposal is answered in the same bytes as the same push to a forge holding none. measured on a throwaway Postgres 18 over a 1,000-change repo with one-change pushes landing nothing, three interleaved passes of 45 pushes per arm: per-pass medians 1.80 to 1.90 ms with the decision removed, 2.18 to 2.23 ms with it and nothing open, 4.52 to 5.94 ms with 1 to 100 open and flat in the count, against a knowingly wrong arm reading the graph per open proposal at 24.7 to 37.1 ms for 10 and 232 to 360 ms for 100, so the recorded fallback is not taken and ADR 0075 now says so. the proposal read still carries no pipeline verdict; that half of this ticket is left. red under mutation, counts read each time: the list reading change per row (0 passed and 1 failed), each store deriving closes from the head set (0 and 1 on memory and on Postgres, while the existing close case stayed at 1 passed), landed following no parent (0 and 1 on the ingest walk pin), the graph read per open proposal, read with none open and a read after the transaction (0 and 1 each), a landing push answered in other bytes (0 and 1), the tip authors answering every held change (0 and 1), and the Postgres read joined through repo_change (0 and 1 in conformance and in proposal_read), restored to 8, 4 and 1 passed. no migration and no format byte moves; the new read is forge SQL, so the list change reaches the live forge with its next deploy. bash ci/local.sh is green against Postgres 18 (4273 passed over 135 binaries, 10 ignored) (#2235) 3cffe4b6 · dbf3dbe6…

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