2026-09-26

From sources/papers-daily/hf-daily-2026-09-26.md — 25 entries, 24 new after dedup. Upvote counts are that community's popularity signal and nothing more.

Just-in-Time Memory: Learning to Curate Task-Adaptive Memory for LLM Agents — arXiv 2609.27334 (1.65 — the top Paper Pick)

• TL;DR: agent memory systems decide what to keep at write time, before the future query exists, which destroys information irreversibly and creates a long-horizon credit-assignment problem. JitMem keeps raw trajectories and curates at read time, once the task is known. +16.2 / +16.3 / +3.9 absolute success-rate points on ALFWorld / WebShop / τ²-bench over the strongest baseline
• Why read it: the ablation, not the headline — an untrained curator already beats those baselines, so most of the gain is the timing rather than the learning
• → Just-in-Time Memory: Learning to Curate Task-Adaptive Memory for LLM Agents

Agent-Editing World Model: Rethinking World Modeling for LLM Agents — arXiv 2609.28416 (1.65)

• TL;DR: stops predicting tool responses — high-entropy and execution-dependent, "when real feedback is available" — and models task progress instead. An Action Judge sorts decisions Critical / Exploratory / Noisy at 70.5% macro-F1, +10.6 over the strongest frontier baseline; EditAct adds 3.2–6.7 points across six benchmarks and three backbones; AEWM-RFT keeps +2.2–2.6 over Self-RFT without running the world model at inference
• Why read it: paired with JitMem in the same snapshot it is the same argument about a different subsystem — do not compress what you can still go and look at — and neither paper cites the other. Its second finding is less comfortable: an agent's own history is an active source of error, and the fix is to edit it, which leaves the trajectory no longer a record of what the agent did
• → Agent-Editing World Model: Rethinking World Modeling for LLM Agents

PACT: From Credit Assignment to Critic Alignment — arXiv 2609.26355 (1.39)

• TL;DR: three regularity conditions — Completeness, Prefix Consistency, Neutrality — are proved to uniquely determine token-level credit, which is the definition this field has been arguing without. Read off it: an ideal On-Policy Distillation teacher is an implicit critic; response-level RLOO matches token-level credit's expected policy-gradient contribution; and in GAE, critic errors can become comparable to the credit itself. PACT reorders actor and critic for 72.87% on agentic maths (+8.80 over GRPO) and 67.4% on SWE-bench Verified (+2.0 over GRPO)
• Why read it: the results argue against the motivation and the paper does not reconcile them — a four-fold smaller margin on the benchmark where credit is spread over the longest horizon is the opposite of what a theory of long-horizon credit predicts
• → PACT: From Credit Assignment to Critic Alignment

• Two labs shipping real work are in no tier of sources.yaml. Runway (+23 days) and Ant Group (inclusionAI / AntLing) (+4 days) both reached this wiki through a third party — a Latent Space essay and an r/LocalLLaMA post. Both would have arrived on time from a lab-directed poll, and neither is polled. This is a manual file; see 🆕
• A tracked Tier-1 feed went 63 days without a capture while reading OK the whole time. The Transparency Coalition publishes weekly on US state AI legislation; its last snapshot here is 2026-07-24. The feed never failed — its candidates ranked below threshold, run after run, across 85 state laws. Carried to the W39 lint
• A prefetch feed is failing and its own ledger reads green. state/prefetch.json marks Google DeepMind FAIL with ParseError: not well-formed (invalid token): line 1, column 0 against deepmind.google/blog/rss.xml, while last_ok reads 2026-09-25 — so this is today's fetch only, not a dead feed, and the 09-26 precedent about not writing a failed fetch up as a dead source applies. The other 11 feeds are OK
• Meta's Muse partner list does not agree with itself. The 09-23 capture records Walmart and Instacart (2 passes); a pass read today names Walmart and PayPal. Walmart is in both. A retailer and a payment rail are different things against a business model stated as "a small fee from transactions", and no Meta first-party page has been read on either run. Recorded on the page, not resolved
• Anthropic's Alignment Science blog is unreachable for the ninth consecutive run, so its article list still cannot be checked against sources/. Two of the four things it has published while this wiki existed were missed entirely, at +73 and +38 days

Nine pages. The two entity pages and the concept page are the ones to review.

• Runway (new — entity) — created on a release captured +23 days late. Everything but that release is unknown; runway.com is blocked
• Ant Group (inclusionAI / AntLing) (new — entity) — Ant Group / inclusionAI / AntLing are three names for related but distinct things and coverage uses them interchangeably; the page keeps them apart. Everything but the one release is unknown
• World Models (new — concept) — created because the term covers two different things that arrived on the same day from unrelated publishers, with no instrument on which they could be compared. This wiki had carried world-model material on 8+ pages with nothing holding it
• GWM Worlds 2 (new) · Ming-Image-0.1-Design (new)
• Just-in-Time Memory: Learning to Curate Task-Adaptive Memory for LLM Agents (new) · Agent-Editing World Model: Rethinking World Modeling for LLM Agents (new) · PACT: From Credit Assignment to Critic Alignment (new) · Your Transformer Can Hold Two Thoughts at Once: Evidence of Linear Superposition in LLMs (new)

Needs your decision — sources.yaml is a manual file and this run did not edit it. Three additions would have prevented three of today's findings: Runway (official_blogs or x_accounts — @runwayml carried the spec verbatim), inclusionAI / AntLing (a sixth slot in the Chinese-lab rotation, which currently covers DeepSeek, Alibaba, Moonshot, Z.ai and MiniMax), and a threshold exemption for the Transparency Coalition, whose problem is ranking rather than absence.

• AI Governance: the three state executive orders in full, with the 63-day capture gap recorded against them
• Embedded Evaluation: the page's premise changes — the mechanism moves from a lab proposal to a statutory draft in ten days, and who picks the evaluator is no longer the lab's answer
• Frontier Pacing: the kill switch as a brake with no lab origin, which needs no antitrust waiver to impose
• Agents (LLM Agents): JitMem and AEWM as one argument — four papers in a week, each deleting a component built to decide something in advance
• Agentic Reinforcement Learning: PACT's uniqueness proof, and the OPD-as-implicit-critic result landing on a cluster this page has accumulated since 09-02
• Mechanistic Interpretability: superposition now has two meanings on this page — a learned property of the representation, and an architectural property of the input–output map that training erodes. They predict opposite things about pretraining
• Open-Weights Policy Fight: the two-day, two-lab, opposite-direction licensing split
• Embodied Agents: cross-referenced to World Models
• Meta AI: the Muse partner disagreement, plus two single-pass Connect items recorded and not adopted
• index.md: 9 new lines