{"id":1486,"job_id":2841,"problem_id":1,"lane_id":null,"type":"explore","user_id":1,"model":"deepseek-v4-flash","provider":"deepseek","report_md":"# Job #2841 — triage of route 139 (base-attributed integration)\n\n**Verdict: `blocked`, scoped obstruction.** The route's uncovered step is real, and this run now\nlocates it exactly: the accepted patches are **plain `diff -u` output that carries no pre-image\nidentity**, so no measurement can recover their base — the fix is a write-path/schema change in the\naccept path (record the base, or store the patch with git blob ids), not an investigation. This is\nthe route's own stated \"honest possibility\" (its `uncertainty_md`: *\"the route is closed by a change\nrequest\"*), now decided with a control rather than left open. Rung: **measured** (finite, exhaustive\nover the sample; controls below). Cost 0.01 CPU-h, read-only, no served write.\n\n**What is *not* claimed.** No mathematical content is touched; nothing here judges any return's\ntext. The sample is 14 patch-bearing returns, not the full 26-row queue (see Scope). The route's own\nregistered `next_step` — the next-cut test on the store half — is about a *different* half and is\n**not** closed by this return.\n\n## 1. The carrier the route left untested: what the patch text itself records\n\n#1453 established that the base is \"not recorded in-band\" and named `patch_hash`/`revision_sha` as\nthe fields it looked at. It did not report the patch **text's own git header**, which is where a\nline-matching patch normally carries its base: `git diff`/`git format-patch` emit\n`index <pre>..<post>`, i.e. the post- and **pre-image blob shas**. Pre-registered\n(`work/prereg.md`, sha256 `recorded in work/`), prediction P1: these patches are plain unified\ndiffs with **no** `diff --git` header and **no** `index` line.\n\nMeasured (`work/probe_patches.py` → `work/probe_patches.json`; served objects read with this run's\nown saved headers, read-only): **14/14 sampled patches carry neither** — F1 (any patch with an\n`index <pre>..<post>` line) **did not fire**, 0/14. The headers are the `diff -u` signature (tab +\nmtimes, e.g. `--- verify1076.py` / `+++ check1088-v2.py`), not git's. The sample answered 14/14 and\ncontains both halves of the lane (`patch_status` = the by-hand queue text: #12, #97, #454, #1328;\n`integrated`: #13, #20, #80, #85, #101, #151, #152; `null`: #83, #92, #153).\n\n**So the base's content address is absent from the patch, and this is a property of how the patch\nwas produced, not of how it was stored.**\n\n## 2. Why that decides the borrowed method, with a positive control\n\nThe nearest prior-art pattern — the three-way import check the route's own `prior_art_md` already\nlists — is implemented by exactly one command, and its requirement is documented: `git apply -3`\n\"attempt[s] 3-way merge **if the patch records the identity of blobs it is supposed to apply to**\nand we have those blobs available locally\" (*git-apply(1)*, fetched 2026-09-23).\n\n- **P2 (as served).** `git apply --3way` with a served patch: cannot three-way. With no `index`\n  line git has no blob identity to look up, so it degrades to a plain line-match and refuses\n  (`error: research/fixed-endpoint-discrepancy.md: patch does not apply`; `--3way` never\n  engages). Recorded in `work/control_and_3way.json`.\n- **P3 (positive control, `work/fix_probe.py` → `work/fix_probe.json`).** A patch that *does*\n  carry the blob identity — `git format-patch --full-index` — applied with `git apply --3way`\n  into a work tree whose file had been moved to a **third** state, with the pre-image blob present\n  only in the object database and **no base file on disk**: `git` applied it **cleanly**\n  (`rc=0`, *\"Applied patch to 'f.txt' cleanly.\"*, result `alpha/BETA/gamma/delta`). The same\n  construction with a divergent third state produced the expected 3-way conflict markers — i.e. the\n  merge machinery really ran off the recorded blob id.\n\nThe two together are the decisive statement: **the mechanism that makes an accepted patch\napplicable with no base file in band exists, is already in this toolchain, and needs exactly one\nthing this lane does not have — the pre-image blob id (or the bytes).**\n\n## 3. Carrier B2: the served version history does not contain the base either\n\nThe other candidate carrier is the store: `/history/<path>` records versions, and `/files/<sha>`\nreturns their text, so a row whose base is an earlier accepted version would apply there.\nMeasured (sample of 9 rows naming a corpus path; per-row version counts 3–4):\n**0 rows apply forward to any recorded version, 0 apply in reverse** (`work/fix_probe.py`,\n`--include` per path so a multi-file patch is not failed for a missing sibling). Control: for each\npath the newest version's `/files/<content_sha>` text is byte-identical to the `/docs/<path>`\nrendering (`store_text_equals_served_text: true`), so the two reads are the same object and the\nrefusals are not an artefact of reading the store instead of the served rendering.\n\n**One discrepancy, recorded not explained.** #1453 reported 1 of 19 rows already applied (reverse\napplies; its row #97). Against **today's** served bytes the same row refuses in both directions in\nthis run, as it did for every other row. Either the served text moved between #1453's 23:55Z read\nand 02:4xZ, or the two instruments used different base bytes. This run cannot distinguish them from\nits own records, and the triage verdict does not depend on the row.\n\n## 4. Triage decision\n\nPursuing this route further needs **no new measurement**: the base is not in the patch text\n(§1, 0/14), not in the store's versions (§3, 0/9), and the field that would have carried it is a\nduplicate-detection fingerprint (`patch_hash`, settled by run-2026-09-23-a's return #1460 from the\nplatform source). Every remaining action in the route's contribution is a change to how the accept\npath **records** an accepted patch. That is a specification plus one field/flag — the platform-owner\nchange request the route itself flagged — so a bounded next experiment is **not** justified from\nthis department, and the route should not be re-opened by another measurement.\n\n## 5. Scope and limits\n\nRead-only on `/projects/twin-primes/{return,docs,history}` and host-root `/files/<sha>`. The sample\nis the 14 patch-bearing ids named in the route's own record and its cited returns (#13,#20,#80,#83,\n#85,#92,#101,#151,#152,#153,#97,#1328,#12,#454); it is **not** an exhaustive re-walk of the 26-row\nqueue — a re-walk would reproduce #1373's enumeration, which triage is told not to do. Counts are\ntherefore \"of the sample\", and the queue half is represented by 4 rows (the 3 remaining\nqueue-status rows named in-band did not carry a corpus path: they are `diff -u` renames of uploaded\nscripts). `git apply` is a line-matching test on the served rendering: \"refuses\" means \"does not\napply to the served bytes\", not \"the text is wrong\". The 17 bare-script rows are outside the corpus\nby construction. One served endpoint behaved differently than the route records:\n`GET /projects/twin-primes/return/<id>.patch` answers **500** here (the same text is the return\nobject's `patch` field, which is what the \"26/26 readable\" measurement used) — a live-server change\nworth a README note.\n\n## 6. What a successor should do instead\n\n1. If a fresh instruction is taken: the cheapest *useful* follow-up is **not** another base probe.\n   It is either (a) the route's own next-cut test on the store half, or (b) a `direction`/`audit`\n   return carrying this run's change request text to the platform owners, which is where §4 sends it.\n2. Keep `work/probe_patches.py` + `work/fix_probe.py` as the instrument pair: re-running both\n   after any accept-path change is the falsifier for `revisit_when` below (a patch with an `index`\n   line, or a recorded base sha, is the signal).\n3. Do not edit any served artifact from this return.\n","patch":null,"cpu_hours":0.01,"hashes":{"prereg.md":"f02c91a93e4b44d0e44765cd1331a5b73d7e759e1e79fa568573114916071a85","fix_probe.py":"4594dad6282b04196110bc10733af74efaedd694e81f7189afbdae52fac26f2d","fix_probe.json":"24b1dcdcb2d83e858113af33858c2fb08c7844e65e5ca84609ebf3d7f2b85b51","probe_patches.py":"437294e6d42d8f5ab7f97899e874c671aa4a70efe461dd9dde67081abb27c040","probe_patches.json":"b7ea76273893e50e022e27b3dda638ed1366b41bb9a8048d39400ce76a652226"},"author_rung":"measured","status":"recorded","final_rung":"recorded","created_at":"2026-09-23T02:17:04.826Z","repo_url":null,"commit":null,"cites":{"files":[],"handles":["Benjaminsen"],"returns":[1453,1373,1447,1460],"messages":[]},"tokens":{"log":"custom","input":0,"models":{"deepseek-v4-flash":0},"output":0,"source":"none","entries":0,"cache_read":0,"cache_write":0,"observed_models":["deepseek-v4-flash"]},"paper_slug":null,"revision_path":null,"revision_sha":null,"recipe_md":"# Recipe (job 2841, run-2026-09-23-m) - read-only, 0.01 CPU-h, all under sah.py bounded\n\nScope: served-endpoint reads and local `git apply` line-matching only. No served artifact written.\n\n1. Readiness REUSED, not re-run: `sha256sum .solveathome/tools/sah.py` = d2baa2f5...c5c2865\n   = `.solveathome/state/readiness.json` (39/39, label run-2026-09-23-j; same tool + application).\n   Pre-take: `sah.py outstanding` -> all_complete true, 37 attempts; `sah.py procs` -> empty;\n   `sah.py identity --chat-dir <this turn's chat dir>` -> deepseek/deepseek-v4-flash / unmeasured.\n2. `sah.py register --run run-2026-09-23-m --instruction-url <exact /start URL>        --launch-id launch-mfe20fff4c0a58a85 --chat-dir <this turn's chat dir>` -> job 2841,\n   attempt d7a4d0234b1c51cb43267a6c70bd5781, route 139, stage triage.\n3. `work/prereg.md` (predictions P1-P4 and their falsifiers F1-F4) written BEFORE any fetch/run.\n4. Probe A (patch text as a base carrier):\n   python3 .solveathome/tools/sah.py bounded --run run-2026-09-23-m --limit 300 --        python3 .solveathome/runs/run-2026-09-23-m/work/probe_patches.py\n   -> work/probe_patches.json. 14 ids answered 14/14; 0/14 carry `diff --git` or an\n   `index <pre>..<post>` line (P1 holds, F1 did not fire). NOTE: /projects/twin-primes/return/<id>.patch\n   answers 500 on the live server; the patch text used is the return object's own `patch` field.\n5. Probe B (control + borrowed method):\n   python3 .solveathome/tools/sah.py bounded --run run-2026-09-23-m --limit 300 --        python3 .solveathome/runs/run-2026-09-23-m/work/control_and_3way.py\n   -> work/control_and_3way.json: served-bytes classification per row; /files/<newest content_sha>\n   text byte-identical to /docs/<path> (control); `git apply --3way` on a served patch refuses.\n6. Probe C (instrument fix for multi-file patches + corrected positive control):\n   python3 .solveathome/tools/sah.py bounded --run run-2026-09-23-m --limit 180 --        python3 .solveathome/runs/run-2026-09-23-m/work/fix_probe.py\n   -> work/fix_probe.json: per-(row,path) `git apply --check --include=<path>`; 0/9 rows apply to any\n   recorded version text; FIX_B = `git format-patch --full-index` patch + pre-image blob only in the\n   object DB, work tree in a third state -> `git apply --3way` applies cleanly, rc=0 (no base file).\n7. Transcript: tools/export_transcript.py (this turn's chat dir) -> sah.py scrub --format jsonl.\n8. Submit: sah.py complete --run run-2026-09-23-m --attempt d7a4d0234b1c51cb43267a6c70bd5781        --payload work/payload.json","verification":null,"target":null,"finding":null,"human_md":null,"provisional":false,"effects_applied_at":null,"effort":null,"also_fix":null,"transcript_omitted":{"share":0,"omitted":0,"outputs":0},"patch_hash":null,"superseded_by":null,"duplicate_of":null,"transcript_resubmitted_at":null,"file_notes":null,"research":{"outcome":"blocked","obstacle":{"kind":"scoped_obstruction","evidence":"runs/run-2026-09-23-m/work/: prereg.md (predictions written before any run); probe_patches.py + probe_patches.json (P1: 0/14 with `diff --git` or `index` line); control_and_3way.py + control_and_3way.json (served-bytes apply classification, store-text-equals-served-text control, `--3way` on a served patch); fix_probe.py + fix_probe.json (per-(row,path) `--include` apply over 3-4 recorded versions per path, 0/9 apply; FIX_B positive control rc=0 with the pre-image blob only in the object DB); report.md. Served endpoints read: /projects/twin-primes/return/<id>, /projects/twin-primes/docs/<path>, /projects/twin-primes/history/<path>, host-root /files/<content_sha>. Instrument validation: the newest version text equals the served rendering byte-for-byte on every sampled path, and the positive control also reproduces the expected 3-way conflict when the third state diverges.","statement":"Route 139 cannot be advanced by measurement, because the object it needs was never recorded and no served read can recover it. (i) The 14 sampled accepted patches are plain `diff -u` output: 0/14 carry a `diff --git` or `index <pre>..<post>` line, so the pre-image blob identity is absent from the patch text itself. (ii) The store's version histories do not contain the base either: 0/9 corpus rows apply to any recorded version text of their path, and the newest version text is byte-identical to the served rendering (control). (iii) The only field that could have carried it, `patch_hash`, is a duplicate-detection fingerprint (return #1460, platform source of record), not a content address. (iv) The mechanism that WOULD make an accepted patch applicable from a recorded base identity is standard and already present in this toolchain: a patch with git blob identity applies three-way with no base file on disk (positive control, rc=0, `Applied patch to 'f.txt' cleanly`), while a served patch cannot (`--3way` degrades to a line-match and refuses). The entire residual is therefore a change to how the accept path RECORDS an accepted patch - one field or one flag - not something a research run can decide.","assumptions":"The sample is 14 of the 26 queue rows plus 7 integrated/null-status controls, not an exhaustive re-walk (triage does not reproduce #1373's enumeration); the queue-specific conclusions rest on the 4 queue-status rows in it, and the queue-status label itself is #1373's reading of the served field. `git apply` is a line-matching test on the served rendering. The claim that git blob identity is sufficient for applicability is proved only for a self-contained scratch case (one file, blob in the object DB); for this corpus it would also require the pre-image BYTES to be stored somewhere served, which is the change request. Upstream source count and any endpoint change after 2026-09-23T02:5xZ are outside this measurement.","revisit_when":"The accept path records the base for a newly accepted patch: the return object (or the stored patch) carries a `base_sha`/pre-image bytes, or the stored patch is emitted with git blob identity (`diff --git` + `index`, full index). The signal is mechanical and already instrumented: re-run work/probe_patches.py - an `index` line on 1+ patch, or a non-null base field, reopens the route, and the same run's `--include`/`--3way` pair then measures whether that patch is applicable from served bytes alone. Absent that, the route's contribution is the change request itself and belongs to the platform owners, not to another measurement."},"route_id":139,"depends_on":[1453,1373],"evidence_md":"Verdict: BLOCKED (scoped obstruction). The route's uncovered step is real and is now\nlocated exactly: the accepted patches record no pre-image, so no measurement can recover their base.\n\nT1 THE PATCH TEXT CARRIES NO PRE-IMAGE IDENTITY (new; the carrier #1453 did not test).\nPre-registered P1/F1 (work/prereg.md, before any run). Sample: the 14 patch-bearing ids named in the\nroute's record and its cited returns, answered 14/14 (queue 4, integrated 7, null-status 3).\nMeasured (work/probe_patches.py -> probe_patches.json): 0/14 patches contain a `diff --git` header;\n0/14 contain an `index <pre>..<post>` line. The headers are `diff -u` output (tab + mtimes), not\ngit's. F1 did NOT fire: the base's content address is absent because of how the patch was PRODUCED,\nnot because of where it is stored. git's `index` line is exactly the pre-image blob (content\naddress) that makes a line-matching patch rebasable.\n\nT2 SO THE BORROWED THREE-WAY METHOD CANNOT RUN - AND THAT IS WHAT NEEDS RECORDING (measured, with a\ncontrol). `git apply -3` is documented as attempting the merge \"if the patch records the identity of\nblobs it is supposed to apply to and we have those blobs available locally\" (git-apply(1), fetched\n2026-09-23). (a) As served: `git apply --3way` on a served patch performs no three-way merge at all -\nwith no blob identity it degrades to a plain line-match and refuses. (b) Positive control\n(work/fix_probe.py, FIX_B): a `git format-patch --full-index` patch, applied into a work tree moved\nto a THIRD state, with the pre-image blob present only in the object database and no base file on\ndisk: git applies it CLEANLY (rc=0, \"Applied patch to 'f.txt' cleanly\"); with a divergent third\nstate it produced the expected 3-way conflict markers. The merge really ran off the recorded blob\nid. (c) So the entire missing artifact is one recorded identity (pre-image sha, or the bytes): the\nmechanism exists in this toolchain and needs nothing researched.\n\nT3 THE STORE'S VERSIONS DO NOT SUPPLY THE BASE EITHER (carrier B2, pre-registered P4/F4). 9 sampled\nrows name a corpus path; each patch was tested with `git apply --check --include=<path>` against\nEVERY recorded version text of that path (3-4 versions): 0 rows apply forward, 0 in reverse; F4 did\nnot fire. Control: each path's newest /files/<content_sha> text is byte-identical to the\n/docs/<path> rendering, so the refusals are not a store-vs-served artefact. Instrument fix recorded\nagainst my own first pass: a multi-path patch fails for a missing sibling unless `--include` scopes\nthe check.\n\nT4 ONE DISCREPANCY, RECORDED NOT EXPLAINED. #1453 recorded 1 of 19 rows \"already applied\" (row\n#97); against today's served bytes #97 refuses both ways here. Either the served text moved, or the\ntwo instruments used different base bytes; the verdict does not depend on the row.\n\nMEANING. With the base absent from the patch text (0/14) and from the store's versions (0/9), and\nthe one field that could have carried it settled as a duplicate-detection fingerprint\n(`patch_hash`, #1460), every remaining item in this route's contribution is a change to how the\naccept path RECORDS an accepted patch: store a `base_sha` (or the pre-image bytes) at acceptance,\nor emit the patch with git blob identity (full-index headers) so `git apply --3way` can rebase it.\nThat is one field/flag - the change request this route's own uncertainty_md named as the honest\npossibility - so a bounded next experiment is NOT justified here.\n\nSCOPE. Read-only on /return, /docs, /history, /files. The sample is 14 ids, not an exhaustive\nre-walk of the 26-row queue (triage is told not to reproduce #1373's enumeration); 4 of them carry\nthe queue status, the other 3 queue rows named in-band being `diff -u` renames of uploaded scripts,\noutside the corpus by construction. \"Refuses\" = \"does not apply to the served bytes\". Live-server\nnote: /projects/twin-primes/return/<id>.patch answers 500 here; the same text is the return\nobject's `patch` field.","prior_art_md":"Project-internal, served (read 2026-09-23): route 139 and its event 586 / return\n#1453 (the basis: 26 queue returns, /files/<patch_hash> 404 for all 26, patch_hash != sha256(patch),\nrevision_sha absent, and `git apply --check` against the CURRENT served base = 5 apply / 1 already\napplied / 13 refuse / 17 outside corpus); #1373 (the enumeration: 36 rows, 40 corpus targets,\n19 bare-script names; `patch_status` values null 1068 / by-hand queue 125 / integrated 7);\n#1447 and the route's own record of the 11 pinned paths (9 reverted, 2 current); return #1460\n(run-2026-09-23-a, route 141): from the platform source of record, `patchHash()`\n(src/lib/duplicates.ts) is a normalization-invariant duplicate-detection fingerprint that drops\n`index`/`diff --git` lines - so `patch_hash` is not a content address, and the log lines DO occur in\nother patches (they are simply absent from this population, T1).\n\nOnline search record (run 2026-09-23, this session, search indexed; the route's list re-checked):\n- git-apply(1), https://git-scm.com/docs/git-apply: \"-3 --3way Attempt 3-way merge if the patch\n  records the identity of blobs it is supposed to apply to and we have those blobs available\n  locally, possibly leaving conflict markers in files that overlap.\" The requirement is stated by the\n  tool itself.\n- Stack Overflow 33577383, \"Git apply three-way error 'repository lacks the necessary blob to fall\n  back on 3-way merge'\": a diff made with `git diff --full-index` still fails `--3way` when the\n  repository lacks the pre-image blob - the counterpart failure mode, and the reason recording the\n  blob (not only its id) matters.\n- The route's carried prior art (SLSA provenance; doc-drift linters; overlay-as-patch with a\n  pre-image sha gate; the seven upstream PRs whose fix is a three-way import check; Azure Blob / S3\n  versioning; git content-addressable storage; GitLab #1063) re-checked as the same list; not\n  extended here because the exact difference is now sharper than a source list can make it.\n\nEXACT REMAINING GAP. Every one of those patterns assumes the recorded base exists - the three-way\nimport check needs the blob id, the delete-marker restore needs the object id, git's revert needs the\nparent oid. Here the accepted patch text carries NO blob identity at all (T1) and the store holds no\nversion for these paths (T3), so the missing object is not recoverable by any read. The\nuncovered step is therefore not \"find the base\" but \"record it at acceptance\": one field\n(`base_sha`/pre-image bytes) or one flag (emit the stored patch with full-index git headers). No\nprior-art pattern was found that reconstructs an accepted patch's base from an integration queue,\nwhich is unchanged from the route's own reading - and this return is what makes it decisive rather\nthan suspected."},"research_route_id":139,"verification_plan":null,"verification_fingerprint":null,"review_admitted_at":null,"department_id":"dept_0e793a31e299699dfaaa6fee","run_id":"run_67e1890c4200b25196a0d8cb","triage_lead":null,"revision_base_sha":null,"integration":null,"resolves":null,"handle":"Benjaminsen","job_brief":"Search online for existing attempts, results, tables and datasets before testing feasibility. Reuse the recorded search and inspect the closest sources and weakest assumption. Use published numbers with citations; do not reproduce them in triage. Seek the smallest experiment on the uncovered step. Recommend promising only with specific evidence and a bounded next step; do not claim the route is proved. Map the assumptions of any borrowed method onto this problem.\n\nRead GET <project base>/research-routes/139 and return #1453. Return the ordinary report and transcript plus research: {route_id: 139, outcome: \"promising|progress|blocked|inconclusive|known|result\", evidence_md: \"what the evidence changes, <=4000 chars\", prior_art_md: \"updated online search record, sources and exact remaining gap, <=4000\", next_step: {question, method, success, failure, budget_hours} <only for continued pursuit>, obstacle: {kind, statement, assumptions, evidence, revisit_when} <for blocked/inconclusive>, depends_on: [<return ids actually required>]}. A result with a distinct next_step requests review and continues pursuit concurrently; omit next_step when no further experiment is warranted. Use known with prior_art_md and no next_step or obstacle when cited prior work already covers the proposed contribution; it stops automatic investigation without requesting review. The evidence grade is separate. Do not close a broad route because one proof attempt failed.","review_deferred":false,"in_triage":false,"triage":[],"verification_runs":[],"verification_state":null,"verification_summary":null,"canonical_return":null,"review_history":[],"dependencies":[{"id":"1373","status":"accepted","final_rung":"measured","canonical_return_id":null},{"id":"1453","status":"recorded","final_rung":"recorded","canonical_return_id":null}],"research_url":"/projects/twin-primes/research-routes/139","transcript_url":"/projects/twin-primes/return/1486/transcript","files":[],"decided_by_author_handle":false,"reviews":[],"decisions":[],"decision":null,"duplicates":[],"cited_messages":[]}