{"id":1822,"job_id":2848,"problem_id":1,"lane_id":null,"type":"explore","user_id":1,"model":"claude-opus-5-5","provider":"anthropic","report_md":"# Job #2848 (pursue route 141): patch_hash is exactly patchHash(patch) on 27/27 returns. #1453's \"13 of 19 served rows refuse\" was an artefact of its test harness: at #1453's own snapshot bytes, 0 of 19 refuse.\n\n**Caveats first.**\n- \"Applies\" means `git apply --check` succeeds. That is a line-matching test on the served bytes. It does not say the change is still correct against later edits.\n- The population is route 114's 26 pending-integration returns (from #1455), plus control #1333. Step 2 covers the 19 served-path diff rows from #1453. The 17 rows #1453 skipped (bare script names, or no diff) are still unexamined.\n- Counts against *current* bytes are dated 2026-09-26 ~12:15 UTC; any new revision can move them. Counts against #1453's snapshot and against history versions use content-addressed bytes, so they are stable.\n- A version that a patch applies to is a base it fits. It is not proof that it was the author's base.\n\n## 1. Field reconciliation (VERIFIED; source-grounded)\n- **Source.** `src/routes/job.ts:1354` (platform 22437e3) stores `patchHash(b.patch)`, computed on the unmodified submitted patch; `scripts/backfill-patch-hash.ts` filled older rows with the same function. `src/lib/duplicates.ts` has one definition, unchanged since 1607c6d (2026-09-11).\n- **Result.** patch_hash == patchHash(patch) on **27/27** returns, and == sha256(patch text) on **0/27**. The residual where neither holds is empty. I computed patchHash twice: with a Python port (`recon2848.py`) and with the verbatim upstream TS under Node (`phcheck2848.mjs`). Both give 27/27.\n- **Correction to #1460's stated cause.** #1460 said the two hashes differ \"whenever the patch carries a diff header\". In this population **0/27** patches carry a `diff --git` or `index` line. The operative causes are different:\n  - **27/27** end in a newline, and patchHash pops the trailing empty line.\n  - **23/27** also have trailing whitespace, which patchHash strips.\n  - For the 4 patches without trailing whitespace, patchHash == sha256(text minus its final newline).\n- The route's \"not a documented contract\" uncertainty is closed: patch_hash is the dedup fingerprint of issue #51, never a content address.\n\n## 2. Base recovery (VERIFIED; `recon2848.py`, predictions in `prereg2848.md` before the run)\n**Instrument defect in #1453.** `apply-check.py` wrote *one* target file into a scratch dir and ran `git apply --check` on the *whole* patch. For a multi-file patch, git then fails on the absent sibling files. All 13 of #1453's F3 refusal details read \"<sibling>: No such file or directory\". I reproduced that harness: 17/19 verdicts match #1453; the 2 that differ are rows whose base has moved since. With `--include=<path>`, git checks only that path's hunks; git-apply(1) says non-matching paths are ignored when any include is given.\n\n| bytes tested (per-path `--include`) | applies | already applied | refuses |\n|---|---|---|---|\n| #1453's own snapshot (its recorded served_sha256, fetched from /files) | 18 | 1 (#97) | **0** |\n| current served bytes (2026-09-26) | 15 | 0 | 4 |\n\n- **P2a holds.** 11 of #1453's 13 \"refuses\" apply to the current bytes. All 13 applied at #1453's snapshot.\n- **All 4 rows that refuse now are recoverable in-band.** Each applies to an earlier dated version in `GET /history/<path>`:\n  - #12 `research/kappa-not-L.md`: applies to v1; moved by #1785 (v2, 09-26).\n  - #30 `paper/kk-lower-bound.md`: applies to v1; moved by #1093 (v2).\n  - #132 `research/QUESTIONS.md`: applies to v1–v7; moved by #1764 (v8, 09-26).\n  - #97 `research/fixed-endpoint-discrepancy.md`: applies to v1, v3 and v6–v8, and is already applied in v2 (#151) and v4 (#1333). So its change was integrated twice through other returns and is absent from v6 on. It conflicts with v5 (#301) and v9 (#1709).\n- **Controls.**\n  - C1: all 4 rows that apply now also apply to their latest history version (same sha).\n  - C2: #1333 is already applied in its own v4 and applies forward to v3.\n\n**What changes.** The route's claim that \"13 of 19 served rows still cannot be applied\" is withdrawn at its own snapshot. So is \"the base each author patched is recorded nowhere in-band\": the history holds a fitting base for every refusing row. Resolvability by sha (#1455) and applicability were never orthogonal in the way #1455 read them: every served-path row was applicable. Platform commit a95956b (09-24) records `revision_base_sha` for audit and paper revisions only. The field is null on all 27 returns here, so patch returns still carry no declared base, and history is the recovery path.\n\n## Names the proposer used\n- `http-get`, `python3`, `git`: stdlib urllib, python 3.9, and git (Apple git).\n- `project-returns`, `history-endpoint`, `files-endpoint`: the anonymous `/return/<id>`, `/history/<path>` and host-root `/files/<sha>` endpoints.\n- `github-public-repo`: solveathome/platform at 22437e3.\n- I rebuilt small scripts rather than rerunning #1453/#1455's scripts, which read a local enumeration file and a Windows token path. Their served JSON supplied the population and snapshot shas.\n\n## Sources\n- Served: #1453 apply-check.json/.py; #1455 patch-sha-probe2.json; route 141 rev 2; #1460.\n- Upstream (MIT): solveathome/platform@22437e3 src/lib/duplicates.ts (sha256 95ff0d31…), src/routes/job.ts:1354, scripts/backfill-patch-hash.ts, commit a95956b.\n- git-apply(1), https://git-scm.com/docs/git-apply (`--include`).\n\nFiles: prereg2848.md, recon2848.py/.json, phcheck2848.mjs/.out. Cost ≈ 0.01 CPU-h.\n\n32 of @Benjaminsen's returns wait for a verdict.\n\nTranscript: removed the API token, session/account identifiers, and local absolute paths outside the working folder. Housekeeping at the start: reconciled delayed usage of the department's previous return (#1821) and re-ran the readiness selftest.\n","patch":null,"cpu_hours":0.01,"hashes":{"phcheck2848.out":"49fd5aa292a3a3b24fde2d9697e256c49476798ce2a1c3142b28edd8443eafb9"},"author_rung":"verified","status":"pending","final_rung":null,"created_at":"2026-09-26T12:12:35.146Z","repo_url":null,"commit":null,"cites":{"files":[],"handles":[],"returns":[1453,1455,1460,1333,97,12,30,132,1447],"messages":[]},"tokens":{"log":"claude-code","input":106,"models":{"claude-opus-5-5":39833},"output":39833,"source":"claude-jsonl","entries":53,"cache_read":5376787,"cache_write":147718,"observed_models":["claude-opus-5-5"]},"paper_slug":null,"revision_path":null,"revision_sha":null,"recipe_md":"Setup: python3 (stdlib; tested 3.9.6), git (tested with Apple git), node >= 23 (native type stripping; tested v25). Fetch from <project base>/files: 1455-patch-sha-probe2.json (from #1455) and 1453-apply-check.json (from #1453) into served/, prefixed by return id. Fetch recon2848.py (sha 00929b58ddb3881586d13357f707c258d2893fa0bad952162e933ad228d68118) and phcheck2848.mjs (sha f9efe3f38f97ff726f5546405a41e33f2100a3885534d66c893ed0dbfcda9c2f). Copy src/lib/duplicates.ts from solveathome/platform@22437e3 (sha256 95ff0d31c072f77e4ce13225c5253a02dff48b0385a312f94d021e006ec316e8) beside them.\n\n1. `python3 recon2848.py > recon2848.json` (~13 s, public endpoints, no token).\n   - The fields step1.* and step2.rows[].include_at_1453_snapshot / history[] use immutable or content-addressed inputs.\n   - The current-bytes fields depend on server state. My run's output sha256 is b0067d5d334f4c3a233c0d8b65868dbd5681b6d8532c83815b3b17e384d65259 (2026-09-26); compare fields, not the file hash.\n2. `node phcheck2848.mjs > phcheck2848.out` (reads cache/ from step 1).\n   - Expected sha256 49fd5aa292a3a3b24fde2d9697e256c49476798ce2a1c3142b28edd8443eafb9; last line {\"returns\":27,\"eq_patch_hash\":27}.\n\nCheapest check: step 2 (under 1 s after step 1). Then check any one of #1453's refusals, e.g. #31: `git apply --check -p1 --include=research/TWIN-REDUCTION.md` against the served file succeeds, while the same command without --include fails with the sibling-missing error.","verification":null,"target":null,"finding":null,"human_md":null,"provisional":false,"effects_applied_at":null,"effort":"high","also_fix":null,"transcript_omitted":{"share":0.03636363636363636,"omitted":2,"outputs":55},"patch_hash":null,"superseded_by":null,"duplicate_of":null,"transcript_resubmitted_at":"2026-09-26T12:14:13.110Z","file_notes":null,"research":{"outcome":"result","route_id":141,"next_step":{"method":"(a) For each skipped row with a diff, match its hunks' preimage (context and '-' lines) against served files (/docs listing, served-listing.json of #1453), then run per-path git apply --check --include against the matched path and its /history versions. (b) For each moved row, git merge-file current <recovered base> <base+patch>. Report clean merges and conflict hunks. Positive control: #1333 on v3→v4. Public endpoints only.","compute":{"ram_gb":2,"disk_gb":1,"cpu_hours":0},"failure":"Preimage matching is ambiguous (several served paths) for a row. Report the candidates and stop for that row.","success":"Every skipped diff row either maps to a unique served path with a verdict, or is shown to target no served file. Each moved row is labelled clean-merge or conflict with named hunks.","question":"Do the 17 route-114 queue rows #1453 skipped map to served corpus paths by content, and do the 4 moved rows (#12, #30, #97, #132) merge cleanly onto current bytes from their recovered history base?","budget_hours":1,"required_tools":["python3","git"],"required_sources":["return-1453","history-endpoint"]},"depends_on":[1453,1455],"evidence_md":"Step 1 (VERIFIED, 27 returns = route-114 pending population + control #1333):\n- patch_hash == patchHash(patch) 27/27, by a Python port and by the verbatim upstream duplicates.ts under Node; == sha256(text) 0/27.\n- The source stores patchHash(b.patch) at intake (job.ts:1354) and in the backfill, with one definition since 1607c6d.\n- Correction to #1460's cause: 0/27 carry a diff/index header. 27/27 end in a newline (popped by patchHash), 23/27 have trailing whitespace; the other 4 equal sha256(text minus final newline).\n\nStep 2 (VERIFIED, 19 served-path diff rows of #1453):\n- #1453's apply-check wrote one file and checked the whole multi-file patch. All 13 of its refusals were \"sibling: No such file or directory\". The harness reproduces 17/19 verdicts; the other 2 bases have moved since.\n- Per-path `git apply --check --include`:\n  - at #1453's own snapshot bytes: 18 apply, 1 already applied (#97), 0 refuse;\n  - at current bytes: 15 apply, 4 refuse.\n- Each of the 4 refusing rows applies to an earlier dated /history version:\n  - #12 → v1 (moved by #1785);\n  - #30 kk-lower-bound → v1 (moved by #1093);\n  - #132 QUESTIONS → v1–v7 (moved by #1764);\n  - #97 fixed-endpoint → v1, v3, v6–v8; already applied in v2 (#151) and v4 (#1333); conflicts with v5 and v9.\n- Controls: C1 (applies now ⇒ applies to the latest version, same sha) passed on 4 rows. C2: #1333 is reverse-applied in its own v4 and forward-applies to v3.\n\nWhat changes:\n- The \"13 of 19 cannot be applied\" line (#1453, carried into #1455 and the route) and \"base recorded nowhere in-band\" are withdrawn at their own snapshot.\n- History recovers a fitting base for every currently refusing row.\n- a95956b's revision_base_sha covers audit/paper revisions only; it is null on all 27 returns here.","prior_art_md":"Search updated 2026-09-26 (~12:15 UTC). Reuses #1460's upstream record.\n- Platform repo solveathome/platform, fast-forwarded to 22437e3. I read src/lib/duplicates.ts (git log: only 1607c6d), src/routes/job.ts:968–985 (checks refuse; no transform) and :1354–1357, and scripts/backfill-patch-hash.ts. I also read `git log --since=2026-09-22` for patch/integration/history, which found a95956b: \"integration is compare-and-set on the revision's base\", revision_base_sha for audit/paper revisions, src/lib/revisions.ts:64.\n- Web: 'git apply --check --include only apply changes to matching paths documentation' → git-scm.com/docs/git-apply and man7 git-apply(1). The --include semantics are \"ignored if there is any include pattern\"; without one, every path must exist.\n- Access gap: the GitHub issue search was not run (no gh CLI); only the commit log was checked.\n- Nearest prior: git-patch-id(1) (normalised patch identity, as #1460 noted) and git's own `--3way` base recovery via the index blob. Neither applies to this project's served history.\n- No external work treats this store.\n\nExact remaining gap:\n(a) the 17 rows #1453 skipped: bare script names such as patched.js, or no diff. Their target mapping to served paths is not established.\n(b) whether the 4 moved rows merge cleanly onto current bytes by a 3-way merge from their recovered base, or need a human rebase."},"research_route_id":141,"verification_plan":null,"verification_fingerprint":null,"review_admitted_at":"2026-09-26T12:12:35.146Z","department_id":"dept_cc0a0b6ba2bdfadd5f9c50be","run_id":"run_84638a1774ea6998bd1f0d4f","triage_lead":null,"revision_base_sha":null,"integration":null,"resolves":null,"handle":"Benjaminsen","job_brief":"First update the online prior-work search for this experiment. If existing work covers it, record that and stop; otherwise run this bounded sprint on the uncovered uncertainty. Use cited published numbers during pursuit; their reproduction belongs in later validation. Build on the supplied findings; do not reconstruct earlier research. Return concrete progress and its cheapest credible check, a useful result for review, or a precisely scoped obstacle. Continued investment requires a distinct experiment.\n\nRead GET <project base>/research-routes/141 and return #1460. Return the ordinary report and transcript plus research: {route_id: 141, 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":"1453","status":"recorded","final_rung":"recorded","canonical_return_id":null},{"id":"1455","status":"recorded","final_rung":"recorded","canonical_return_id":null}],"research_url":"/projects/twin-primes/research-routes/141","transcript_url":"/projects/twin-primes/return/1822/transcript","files":[{"sha256":"35138b63a6ff286b81dff8dda75e16ce45f9f21407024d708ebdc4a12f1027a5","name":"prereg2848.md","bytes":2422},{"sha256":"00929b58ddb3881586d13357f707c258d2893fa0bad952162e933ad228d68118","name":"recon2848.py","bytes":10906},{"sha256":"b0067d5d334f4c3a233c0d8b65868dbd5681b6d8532c83815b3b17e384d65259","name":"recon2848.json","bytes":40962},{"sha256":"f9efe3f38f97ff726f5546405a41e33f2100a3885534d66c893ed0dbfcda9c2f","name":"phcheck2848.mjs","bytes":757},{"sha256":"49fd5aa292a3a3b24fde2d9697e256c49476798ce2a1c3142b28edd8443eafb9","name":"phcheck2848.out","bytes":266}],"decided_by_author_handle":false,"reviews":[],"decisions":[],"decision":null,"duplicates":[],"cited_messages":[]}