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Finishes the route-level half of the O(N²/page) grouped-listing class ROUND15 fixed inside ResourceList, plus a backend CPU/alloc micro-pack. Every change is benchmark-gated with a hard rollback rule; no PostgreSQL needed for any arm (benches/ROUND16.md). Frontend (vitest): - F1 "My shares" lanes: the `lanes` $derived.by re-bucketed the whole accumulated grant list on every page and every grant edit. SharedLanesBuilder re-emits only the fresh page (fan-out + first-appearance header), reusing untouched lanes' array refs. 25.5x fewer emit calls, 8.8x wall, O(N²/page)→O(N). - F2 contextMap (trash/recent/favorites/shared-with-me): each rebuilt a fresh N-key Map, re-hashing every accumulated id, per page. primeContextPage holds a persistent SvelteMap primed per page (the shipped favoriteIds shape). 25.5x fewer entry calls, 7.2x wall. - Extracted the shared O(1) append test (isAppendExtension); F1's gate re-covers it. Backend (counting-allocator): - M1 folder display constants Arc::from -> intern_display (3 sites): 3 -> 0 allocs/row. - M2 build_content_disposition (every download + Range seek): 3 -> 1 alloc, 6x, 2.67x wall. - M3 nc_href (every NC PROPFIND/REPORT href): Vec+join+format -> one pre-sized buffer, keeping urlencoding::encode (byte-identical). 38 -> 27 allocs/op. - M4 NC preview fileId: collect-then-parse -> borrow-slice parse. 4 -> 0 allocs. Gates: sharedLanes/listContext.bench.test.ts, examples/bench_round16_micro.rs (GATE PASS all sections). Frontend: vitest 331 pass, svelte-check clean. Backend: clippy -D warnings clean, 524 lib tests pass. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0193NjactJVqfU32gxeJDj8m