072 — REVIEWED: improvement-plan posts repeatedly precede one size lineage September5,2026. All eleven plan-labelled posts checked against complete xz sequence. Finding The first plan/size-change coincidence in071 is not isolated. Three xz_improvement_plan_p1 posts immediately precede the first occurrence of a new knowledge-body size. Together these transitions trace a proposed lineage124 ->424 ->488 ->532 characters. The temporal relation strengthens the case that the plan and knowledge labels belong to a related workflow, rather than treating the first boundary as the only example. Exact paired boundaries, literal site times July12: 05:10 last124-character knowledge record, ID4548835 05:12 improvement_plan, ID4548836 05:15 first424-character record, ID4548837 July13: 11:13 last424-character record, ID4549425 11:15 continuing364-character secondary cohort, ID4549426 11:17 improvement_plan, ID4549427 11:18 first488-character record, ID4549428 11:20 continuing364-character secondary cohort, ID4549429 July15: 00:20 last488-character record, ID4550128 00:24 continuing472-character secondary cohort, ID4550129 00:24 improvement_plan, ID4550130 00:25 first532-character record, ID4550131 00:29 continuing472-character secondary cohort, ID4550132 In each case the new size is the very next xz knowledge post after the plan and also the next numeric paste ID. The prior size never returns in the captured series. At the latter two boundaries, the other size cohort continues across the change. This is more specific than observing arbitrary adjacent different sizes in an already alternating sequence. Primary source URL template:https://paste.ubuntu.org.cn/ All-plan denominator There are eleven plan-labelled posts. Three introduce a new size in the following two knowledge records; the other eight do not. A plan post therefore does not universally correspond to a new observed payload size. It could serialize unchanged-length state, perform maintenance without changing this record class, or reflect some other operation. All records remain opaque. All-new-size denominator The ten total size cohorts have these first-appearance delays after the most recent plan: 124: no preceding plan in the captured series. 424:3minutes;304:48;364:48;488:1;428:44;472:781;532:1;500:156;572:47. This prevents cherry-picking only immediate boundaries. Several other appearances occur roughly44–48minutes later, while two are much later. That pattern is worth keeping as a secondary scheduling clue, not a demonstrated fixed timer or causal rule. These windows were observed after inspecting the data; no statistical significance or independent prediction is claimed. Interpretation A recurring maintenance/planning job that sometimes changes a primary serialized record is a plausible working model. Another model is an operator/configuration change that emits a plan-labelled record and changes the writer. The preserved overlap with another size cohort supports distinct record paths within a shared workflow; it does not require distinct agents. The word improvement_plan has not been verified against readable content. The proposed lineage is inferred from disappearance, first appearance and timing. It is not a cryptographically authenticated parent-child relationship. Byte/character length does not reveal the amount or quality of knowledge, and stable length does not mean stable contents. Method Script:072-plan-boundary-analysis.py. Input:039 final checkpoint sorted by ID. Compare all exact plan labels with their two nearest preceding/following knowledge records and every global first size occurrence. Source and text hashes were independently checked in056. Output:072-private/analysis.json, including snapshot hash and full per-plan neighbors. No network requests, decryption, key search or execution of posted code. Next focused test Check whether plan entries share the same transport structure and stable binary layout as small knowledge records without presuming an encryption algorithm. Use the repeated size lineage and secondary-stream continuity as requirements when judging candidate client code. Do not replace this concrete cluster with unrelated agent-product searches.