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Seven policies (LRU, H2O, SnapKV, StreamingLLM, Ada-KV, QUEST, Random) share a prompt-boundary vulnerability: without structural protection, they collapse to near-zero quality on six pure-transformer models (F1$\\leq$0.064). Reserving 10\\% of cache at each boundary recovers 69--90\\% of the $C{=}2{,}048$ reference-ceiling quality on seven LongBench models at $C{=}256$ (13\\% retention); a ten-model panel spans 68--98\\%. An attention-mass pilot (Qwen2.5-3B, $N{=}30$) suggests why: the position-0 sink holds ${\\sim}75\\%$ "},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2605.18053","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.LG","submitted_at":"2026-05-18T08:41:34Z","cross_cats_sorted":["cs.CL","cs.CR","cs.PF"],"title_canon_sha256":"f0dc1398f813077fd602100971b6182543fed8631ef287b667713ec8d6358422","abstract_canon_sha256":"519ac7a04452c52ae35c4a7ba816f66409171cf7063f09a9e6df22e941c4b88b"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-20T00:05:13.450655Z","signature_b64":"pDeBREP2N/XsIQvjx8fBdrF6NBZzb7WP6/R/u8AWybvaDaDOkj+buGeOpGFEt1hnqXGDgD3vpeEQYO7HIEnECw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"01cf2d57eef84f3d27fcaf344f35514ab4892c7b2a504ab1500f12c173787100","last_reissued_at":"2026-05-20T00:05:13.449743Z","signature_status":"signed_v1","first_computed_at":"2026-05-20T00:05:13.449743Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Protection Is (Nearly) All You Need: Structural Protection Dominates Scoring in Globally Capped KV Eviction","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.CL","cs.CR","cs.PF"],"primary_cat":"cs.LG","authors_text":"Gabriel Garcia","submitted_at":"2026-05-18T08:41:34Z","abstract_excerpt":"We study KV cache eviction under a shared globally capped decode-time harness. 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