Forgetting Is All You Need — The 1000-Turn Proof (JLC v2 evidence pack)

Empirical follow-up to JLC v1 (Zenodo DOI 10.5281/zenodo.19681402). Single individual, single mini-PC (Beelink SER8), single ~$20/month cloud inference plan, single continuous 1000-turn / 32.62-hour conversation on 2026-04-23 → 2026-04-24, completed with 0 logged infrastructure errors and 0 retries under the JLC architecture. Cumulative prefill tokens 653,363 (JLC) vs 86,626,579 (equivalent raw long-context baseline, same tokenizer) — a 99.25% reduction. One Stage 2 verified mono-lingual verbatim recall at Δ=969 turns (user's English at T26 reused verbatim by the model at T995, ~32 h apart, JHB capacity 418 tokens at recall time). Bundle includes: paper (v2.tex + v2.pdf), drafts (EN + KO), figures, full plain-text transcript, sha256-locked source manifest, Stage 1 + Stage 2 provenance, per-turn latency profile, deep-recall analysis (Stage 2 verified n=1 verbatim recall + 3 axis-A retrievability observations at strictly weaker grade), 4-AI cold prior + Claude informed follow-up dated 2026-04-25 (median prior probability the report is accurate as stated = 22.5%). Implementation code not included by author policy; all headline numbers are independently recomputable from the raw transcript with tiktoken cl100k_base alone.v2.1 update (2026-04-30) Non-breaking additive version. All v2.0 files (paper PDF, evidence_pack zip, metadata) are carried over from v2.0 without modification. v2.1 adds one raw artifact: tokens.jsonl (1.71 MB, 1022 records) — the per-turn raw token ledger exported unedited from the runtime token tracer. The file includes the main 1000-turn run (turn_logger_path: jhb/default/turns.jsonl) and 22 preceding dry-run turns (multidomain_ko_20260423005748: 20 turns; multidomain_en_20260423042025: 2 turns) carried over without modification — i.e. no cherry-picking before publication. Each line is a JSON object with turn identity, system/user/assistant token and character counts, JHB state transitions, encoder I/O, per-turn compression ratios, retrieval call statistics, totals, USD cost breakdown, cache state, per-stage latency, and any errors or retries. The paper's §5.2 and §10 reproducibility claims are already satisfied by the aggregated ledgers in v2.0's JLC_v2_evidence_pack_2026-04-25.zip; this v2.1 ledger is a transparency bonus and brings v2 into symmetry with the companion 5-tier record at 10.5281/zenodo.19681402. Companion record (5-tier ablation, 100 turns x 7 runs): 10.5281/zenodo.19681402. Paper PDF: unchanged from v2.0. SHA256(tokens.jsonl) = c61989acf9557b548ecfe8df4508d4dabb9f607982feacf944e0ca47a08ffa5c