fix(lint): repair the four main-side gate breaks; string-payload ratchet 359->358

[proggeramlug]

Repairs four lint-gate breaks on main, all found by running the full 60-step gate suite (three were mine, missed by hand-picked gate subsets during today's trains):

• local-binding-type allowlist still pointed at dynamic_dispatch.rs after the train70 split moved guarded_declared_receiver_class_candidate to property_get/dispatch_receiver_class.rs (two PR authors had to work around this).
• Two new open-coded StringHeader payload reads (fix(runtime): inherit Error subclass names (#9440) #9511's key scan, fix(runtime): keep Error diagnostics attached across GC #9550's test) now route through counted readers — the ratchet BASELINE DROPS 359 to 358.
• perf(strings): per-site concat cache for "literal" + proven-small value — bench_object_property beats node #9514's js_string_concat_site_value added to POLL_CAPABLE_RUNTIME (calls js_string_concat_value_box on miss — the gc-root-dominance is blind to the unrooted-register shape: the verbatim pre-#7453 code reports 0 violations in all three modes #7616 shape, exactly as the checker prescribes).
• Unused use super::* in the train76 capture-stash test split (red under -D warnings).

run_lint_gates.sh: all 60 gates pass. Runtime error_side_tables suite 6/6.