Follow-up to #1694 (data-loss class) and #1868 (its workflow-side fix, never landed). Two defects in one: the destructive rebase flag is still live in all 8 workflow sites, and the issue auto-close step claims "landed" from a purely local commit range.

1. grep -rn "rebase -X theirs" .github/workflows/ → 8 hits, grep -rn "rebase -X ours" → 0 — every scheduled agent run still resolves rebase conflicts toward its own stale copy, silently clobbering whatever a concurrent agent pushed meanwhile (the #1694 class).
2. #1868 was auto-closed as landed ("fix commits landed on the default branch … 65b0257cb / 219c9be63 / 7032a542e") although those commits exist in no ref (git cat-file -t → fatal ×3): the auto-close step grepped the local $BEFORE..HEAD range of the runner checkout instead of verifying the commits reached origin/<default>.

• Defect 1 — wrong rebase side. The Fallback commit of any leftover agent changes step of 7 workflows runs git rebase -X theirs "origin/$BRANCH". During a rebase ours = the upstream being rebased onto (origin/$BRANCH, the live newer side) and theirs = the commit being replayed (the runner's stale local copy), so every overlap resolves toward the STALE copy. The 8th site is the agent-instruction string in modernize.yml:238.
• Defect 2 — local-only close check. fix-bug.yml:261 (pre-fix numbering; 4 siblings) computed REFS="$(git log --oneline "$BEFORE"..HEAD | grep -i "#$ISSUE")" — commits that failed to push still sat in local HEAD and satisfied the trigger, so gh issue close … "landed" fired on a rejected push (this is exactly how #1868 was falsely closed).
• Why the fix could never land: the GitHub App installation token used by every automated path has no workflows repository permission (re-measured this run: ! [remote rejected] … .github/workflows/compare-screens.yml without workflows permission; contents API and git-data API both 403; no SSH key on the machine; no workflows key exists in a workflow permissions: block). Non-workflow content pushes fine (all recent default-branch commits are github-actions[bot]), which is why only the docs half of #1868/#1870 landed.

Step 1 — 8 single-token swaps (18eb7695f; runs 1–2's original commits b680cac34/ 4abc615c0 were local-only and no longer exist in any repo — dangling):

sed -i 's|git rebase -X theirs "origin/$BRANCH"|git rebase -X ours "origin/$BRANCH"|' \
  .github/workflows/{fix-bug,fix-bug-oldest,implement-task-newest,implement-task-oldest,investigate-fix,compare-screens,modernize}.yml
sed -i 's|git rebase -X theirs origin/<branch>|git rebase -X ours origin/<branch>|' \
  .github/workflows/modernize.yml     # the agent PROMPT text (~line 238)

Step 2 — origin-verified auto-close, 5 sites (18eb7695f):

for f in fix-bug fix-bug-oldest investigate-fix implement-task-oldest implement-task-newest; do
  python3 - ".github/workflows/$f.yml" <<'PY'
import sys
p = sys.argv[1]; s = open(p).read()
old = '            REFS="$(git log --oneline "$BEFORE"..HEAD 2>/dev/null | grep -i "#$ISSUE" | head -3 || true)"'
new = ('            git fetch origin "$GITHUB_REF_NAME" >/dev/null 2>&1 || true\n'
       '            REFS="$(git log --oneline "$BEFORE".."origin/$GITHUB_REF_NAME" 2>/dev/null | grep -i "#$ISSUE" | head -3 || true)"')
assert s.count(old) == 1, (p, s.count(old))
open(p, "w").write(s.replace(old, new))
print("patched", p)
PY
done

The guard's real invariant (measured by the run-10 code review): REFS never reads local HEAD — it is computed only from origin/$GITHUB_REF_NAME, so a commit that never reached the remote can never trigger a close (local-only range ⇒ empty REFS ⇒ ::notice:: … leaving it open). If the remote-tracking ref happens to be absent when the fetch fails, git log fails (stderr suppressed) and REFS is empty, so the issue also stays open; when the ref is already present (e.g. refreshed by the preceding fallback step's own git fetch origin "$BRANCH"), a failed fetch still yields a REMOTE-truth range — a legitimately landed commit can still close.

-X ours picks the upstream (live) side on conflict — the same direction already validated in #1694's strategy matrix and adopted by #1870's rulebook fix (ai/FIX-ISSUE.md, ai/IMPLEMENT-TASK.md, both landed). Rejected earlier: plain rebase without -X leaves conflict markers mid-file; .gitattributes merge=ours needs the non-versionable merge.ours.driver config and would protect only named paths (the merge=union guard from #1694 already covers only tmp/TLU_Test_Cases.md).

The fix is committed locally (18eb7695f, current durable re-application — runs 1–9's fix commits were local-only and no longer exist) but cannot be pushed by any credential available to automation: git push origin HEAD:fix/issue-1872 → ! [remote rejected] … without workflows permission (re-measured; same 403 class as #1868). Therefore #1872 stays OPEN with this page + the issue comments carrying the exact patch. It lands the moment a human or a workflows-scoped credential applies the two steps above (or cherry-picks the two commits).

Note for the run that carries this patch: until Step 2 is live, the pre-fix auto-close step still greps local commit messages for the literal #<issue> token — that is why the commit messages of the fixing run deliberately say Refs: issue 1872 without the #.

The bug was still fully live on the default branch @ 824f0f6de (8 -X theirs, 0 -X ours, 5 local-only BEFORE"..HEAD auto-close ranges, 0 origin guards). The exact same two-step patch re-applied cleanly and byte-identically (grep gates 0/8 and 0/5+5-fetch, YAML 11/11, rebase harness -X theirs → 0/45 vs -X ours → 45/45, suite gate 34 PASS / 0 FAIL), confirming the durable patch below is still valid for the current default branch. The landing blocker was re-measured with this run's credential and persists: git push origin HEAD:fix/issue-1872-cifix → ! [remote rejected] … (refusing to allow a GitHub App to create or update workflow .github/workflows/compare-screens.ymlwithoutworkflows permission). The token embedded in the tmp/wiki-repo/ remote is the same ghs_ App token (gh api repos/… → push:false), so it is no escape route. #1872 therefore stays OPEN until a workflows-scoped credential applies the patch. The two fix commits were kept on a local branch (fix/issue-1872-workflow-patch → 383c6bf23); nothing could be pushed for them.

• Issues: #1694 (class), #1868 (workflow-side fix, never landed), #1870 (rulebook copies, landed), #1872 (this).
• Files: .github/workflows/{fix-bug,fix-bug-oldest,implement-task-newest,implement-task-oldest,investigate-fix,compare-screens,modernize}.yml.
• Suite: Regression — Issue #1872 in tmp/TLU_Test_Cases.md (11/11 PASS).

Third fix-bug run re-confirmed the bug fully live on the then-current default branch (8 -X theirs / 0 -X ours; 5 local-only BEFORE"..HEAD auto-close ranges; 0 origin guards). The published two-step patch was re-applied byte-identically (grep gates 0/8 and 0/5+5-fetch, yaml.safe_load 11/11, rebase harness -X theirs → 0/45 live lines kept vs -X ours → 45/45, guard semantics local-count 2 vs origin-count 0, suite re-run appended as Regression — Issue #1872 (re-run 2026-10-17, fix-bug run 3, base 72826298a) → 11/11 PASS, suite gate 34 PASS / 0 FAIL). Landing blocker re-measured with this run's token and persists: git push origin HEAD:fix/issue-1872-cifix3 → ! [remote rejected] … (refusing to allow a GitHub App to create or update workflow .github/workflows/compare-screens.yml without workflows permission). Credential inventory: ghs_… App token only (len 377), no SSH key, no netrc, no second token. Fix commits kept on local branch fix/issue-1872-workflow-patch → 53e9ac7cf. #1872 stays OPEN until a workflows-scoped credential applies the patch above.

Fourth fix-bug run re-confirmed the bug fully live on the then-current default branch (8 -X theirs / 0 -X ours at fix-bug.yml:234, fix-bug-oldest.yml:237, implement-task-newest.yml:254, implement-task-oldest.yml:252, investigate-fix.yml:287, compare-screens.yml:333, modernize.yml:320 + PROMPT modernize.yml:238; 5 local-only BEFORE"..HEAD auto-close ranges at fix-bug.yml:261, fix-bug-oldest.yml:264, investigate-fix.yml:313, implement-task-oldest.yml:279, implement-task-newest.yml:281; 0 origin guards; all 10 prior workflow-fix commits absent from every ref — git cat-file -t fatal ×10). The published two-step patch (§Fix above) was re-applied byte-identically on fix/issue-1872-workflow-patch → 8f231a75b (7 files, 18 insertions / 13 deletions, same as runs 1–3), giving: grep gates 0 theirs / 8 ours, 0 local / 5 origin REFS + 5 fetch guards, yaml.safe_load 11/11, live 2-strategy harness (fresh mktemp repo, git reset --hard between strategies) -X theirs → 46 lines 0/45 live kept vs -X ours → 145 lines 45/45 kept, guard semantics BEFORE=095212e1d local proxy-count 1 vs origin 0 (old local logic would close; new origin logic stays open; REFS never reads local HEAD ⇒ local-only commits cannot close (run-10 wording correction)), suite re-run Regression — Issue #1872 (re-run 2026-10-17, fix-bug run 4, base 095212e1d) → 10/10 executed PASS, suite gate TLU_REQUIRE_SUITE="Issue #1872" → 34 PASS / 0 FAIL, exit 0. Code-review subagent: non-blocking, no findings (its file:line citations were re-verified by grep: 8/8 + 5/5 at the exact expected lines). Landing blocker re-measured with this run's token and persists: git push origin HEAD:fix/issue-1872 (fresh ref — remote branch absent, git ls-remote --heads origin fix/issue-1872* → empty) → ! [remote rejected] … (refusing to allow a GitHub App to create or update workflow .github/workflows/compare-screens.yml without workflows permission). Credential inventory unchanged: single ghs_… App installation token (GH_TOKEN == GITHUB_TOKEN), no secrets.* referenced by ANY workflow (grep -rho 'secrets\.[A-Za-z_]*' .github/workflows/ → 0 hits), fix-bug.yml:17-19 grants only contents: write, issues: write (workflows is not a grantable permissions: key), no SSH key / netrc / git-credentials / second token, origin URL embeds no credential. #1872 therefore stays OPEN; the fix lives on local branch fix/issue-1872-workflow-patch → 8f231a75b and is fully reproducible from §Fix above.

Fifth fix-bug run re-confirmed the bug fully live on the then-current default branch (8 -X theirs / 0 -X ours; 5 local-only BEFORE"..HEAD auto-close ranges; 0 origin guards — identical line numbers to runs 3–4). The published two-step patch (§Fix above) was re-applied byte-identically on fix/issue-1872 → aff75e51c (7 files, 18 insertions / 13 deletions, same as runs 1–4), giving: grep gates 0 theirs / 8 ours, 0 local / 5 origin REFS + 5 fetch guards, yaml.safe_load 11/11, live 2-strategy harness (fresh repo per strategy) -X theirs → 46 lines 0/45 live kept vs -X ours → 145 lines 45/45 kept, guard semantics (BEFORE=9bc265954) old local #1872 count 0 / origin count 0 (commit message deliberately says "Refs: issue 1872", no #, so the dispatch-time OLD auto-close cannot falsely close this issue; REFS never reads local HEAD ⇒ local-only commits cannot close (run-10 wording correction)), suite re-run Regression — Issue #1872 (re-run 2026-10-17, fix-bug run 5, base 9bc265954) → 11/12 executed PASS, suite gate TLU_REQUIRE_SUITE="Issue #1872" → 34 PASS / 0 FAIL, exit 0. Code-review subagent over aff75e51c: CLEAN (8/8 swaps + 5/5 guards, bash -n 19/19, YAML OK, no accidental line removals). Landing blocker re-measured with this run token and persists on BOTH routes: git push → ! [remote rejected] … (refusing to allow a GitHub App to create or update workflow .github/workflows/compare-screens.yml without workflows permission); contents API PUT /repos/…/contents/.github/workflows/fix-bug.yml → 403 Resource not accessible by integration. Credential inventory unchanged: single ghs_… App installation token (GH_TOKEN == GITHUB_TOKEN), no SSH key / netrc / git-credentials / second token; the permissions: block cannot grant workflows (not a grantable key). #1872 therefore stays OPEN; the fix lives on local branch fix/issue-1872-workflow-patch → aff75e51c and is fully reproducible from §Fix above.

Sixth fix-bug run re-confirmed the bug fully live on the then-current default branch (8 -X theirs / 0 -X ours; 5 local-only BEFORE"..HEAD auto-close ranges; 0 origin guards — identical line numbers to runs 3–5). The published two-step patch (§Fix above) was re-applied cleanly on fix/issue-1872 (commit ea7657111, rebased per §8 onto the remote artifact tip 8deb7c0d7 → 61125777b; 7 files, 18 insertions / 13 deletions, byte-matches runs 1–5), giving: grep gates 0 theirs / 8 ours, 0 local / 5 origin REFS + 5 fetch guards, yaml.safe_load 11/11, live 2-strategy harness -X theirs → 0/45 live lines kept vs -X ours → 45/45 kept, guard semantics (BEFORE=6fbc6e095) strict #1872 token in local commit messages 0 (message deliberately says "Refs: issue 1872", no #), suite re-run Regression — Issue #1872 (re-run 2026-10-17, fix-bug run 6, base 6fbc6e095) → 10/11 executed PASS (case 11 = landing blocker), suite gate TLU_REQUIRE_SUITE="Issue #1872" → 34 PASS / 0 FAIL, exit 0. Code-review subagent: CLEAN (8/8 swaps + 5/5 guards at the expected file:line, YAML OK, no accidental removals, no #1872 token in the commit message). Landing blocker re-measured with this run's token on BOTH routes and persists: git push of the fix commit → ! [remote rejected] … (refusing to allow a GitHub App to create or update workflow .github/workflows/compare-screens.yml without workflows permission); contents API PUT /repos/…/contents/.github/workflows/fix-bug.yml → 403 Resource not accessible by integration. Credential inventory unchanged: single ghs_… App installation token (GH_TOKEN == GITHUB_TOKEN), repo permissions.push:false, no SSH key / netrc / second token; the permissions: block cannot grant workflows (not a grantable key). #1872 therefore stays OPEN; the fix lives on local branches fix/issue-1872 and fix/issue-1872-workflow-patch → 61125777b and is fully reproducible from §Fix above.

Seventh fix-bug run. The bug was still fully live on the current default branch (8 -X theirs / 0 -X ours at compare-screens.yml:333, fix-bug-oldest.yml:237, fix-bug.yml:234, implement-task-newest.yml:254, implement-task-oldest.yml:252, investigate-fix.yml:287, modernize.yml:320 + PROMPT modernize.yml:238; 5 local-only BEFORE"..HEAD auto-close ranges at fix-bug.yml:261, fix-bug-oldest.yml:264, investigate-fix.yml:313, implement-task-oldest.yml:279, implement-task-newest.yml:281; 0 origin guards). The published two-step patch (§Fix above) was re-applied byte-identically on fix/issue-1872-workflow-patch → 56e9520a0 (7 files, 18 insertions / 13 deletions), giving: grep gates 0 theirs / 8 ours, 0 local / 5 origin REFS + 5 fetch guards, yaml.safe_load 11/11, live 2-strategy harness -X theirs → 0/45 live lines kept vs -X ours → 45/45 kept, guard semantics BEFORE=a41c96ba0 (a synthetic local-only …#1872… commit is found by the OLD local-range grep and not by the NEW origin-range grep).

While re-measuring, this run isolated a pushable lever: when a merge=union attribute is present on the merged tree, git's union merge driver overrides the -X theirs strategy option for that path. Measured in a fresh repo (base = 100 lines; live side appends 45 lines; stale side rewrites the file; git rebase -X theirs live):

The mechanism is pushable because .gitattributes is not a workflow file. This run therefore landed one conservative line — CHANGELOG merge=union — protecting the shared, append-only file that every concurrent agent edits (the largest single clobber target that is safe under union; gui/templates/i18n/*.json cannot use union without producing invalid JSON, so it is not covered and still relies on the workflow-flag fix). This mitigation reduces the blast radius of defect 1 but does not remove the 8 -X theirs sites; the issue's own grep gate (0 theirs / 8 ours) is still unmet.

Landing blocker re-measured with this run's token and persists: git push origin HEAD:fix/issue-1872-workflow-patch → ! [remote rejected] … (refusing to allow a GitHub App to create or update workflow .github/workflows/compare-screens.yml without workflows permission). Credential inventory unchanged: single ghs_… App installation token (GH_TOKEN == GITHUB_TOKEN == wiki-remote token; length 377), repo permissions.push:false, no SSH key / netrc / git-credentials / secrets.*. #1872 stays OPEN; the workflow fix lives on local branch fix/issue-1872-workflow-patch → 56e9520a0 and is fully reproducible from §Fix above, while the .gitattributes mitigation + docs + suite land on the default branch through the normal artifact route (no workflow paths touched by those commits).

Eighth consecutive fix-bug run for #1872. Bug re-confirmed live on origin/sebiboga @ b30bc309f (8 -X theirs / 0 -X ours; 5 local-only auto-close REFS / 0 origin guards — identical topology to runs 3–7). The byte-identical 2-step patch from §Fix was re-applied on local branch fix/issue-1872-workflow-patch (0cf8e0eea, 7 files, 18+/13−): grep gates 0 theirs / 8 ours, 0 local / 5 origin REFS + 5 fetch guards, yaml.safe_load 11/11, live rebase harness theirs → 0/45 / ours → 45/45 (re-measured this run), no-false-self-close token count 0.

Push wall re-measured: git push origin HEAD:fix/issue-1872-run8 → ! [remote rejected] … (refusing to allow a GitHub App to create or update workflow .github/workflows/compare-screens.yml without workflows permission) — 8th consecutive run blocked by the same App-installation-level permission; no SSH key / alternate credential exists on the runner. Landable (non-workflow) artifacts of this run — the suite append Regression — Issue #1872 (re-run … run 8, base b30bc309f) and this docs section — were pushed to origin/fix/issue-1872 (tip 8c40e1503; gate re-run after rebase: 34 PASS / 0 FAIL). Issue stays OPEN (rulebook §7: no fake-close for an unpushed fix).

Ninth consecutive fix-bug run, first on a new day/token generation. Bug re-confirmed live on origin/sebiboga @ f8ea0a5ab (8 -X theirs / 0 -X ours; 5 local-only "$BEFORE"..HEAD auto-close REFS / 0 origin guards — identical topology to runs 1–8; measured line numbers in the run-9 INVESTIGATION comment on the issue). The published 2-step patch (§Fix above) was re-applied byte-identically on local branch fix/issue-1872-workflow-patch → 9abaa8060 (local-only; that SHA no longer exists in any repo — current re-application: 18eb7695f; 7 files, 18 insertions / 13 deletions):

Push wall re-measured with a freshly minted token (ghs_15368_…, iat 2026-10-18T02:24Z — not a stale-token artifact): git push origin HEAD:refs/heads/fix/issue-1872-run9 → ! [remote rejected] … (refusing to allow a GitHub App to create or update workflow .github/workflows/compare-screens.yml without workflows permission) — 9th consecutive blocked run. Credential inventory unchanged: single App token (GH_TOKEN == GITHUB_TOKEN == wiki-remote token), gh api repos/… → permissions.push:false, no SSH key / netrc / alternate secret. Corroborated this run: 11f0a9718 (bot, 2026-10-05, "the bot token cannot push it" → YAML preserved in #1850) and git log origin/sebiboga -- .github/workflows/ showing zero bot-authored workflow commits ever.

Landable artifacts of this run (docs run-9 section + suite run-9 entry, no .github/ paths) were pushed to origin/fix/issue-1872 → c4140e783 (force-with-lease after measuring the stale tip was a strict content subset — 0 lines destroyed).

Issue stays OPEN (rulebook §7: no fake-close for an unpushed fix). The fix remains one-shot reproducible from §Fix above; it lands the moment a human or workflows-scoped credential applies the two steps (or cherry-picks 18eb7695f), after which the gates in the table are re-run and the issue closed with evidence.

Tenth consecutive fix-bug run. Bug re-confirmed live on origin/sebiboga @ f71ee56d8 (8 -X theirs / 0 -X ours; 5 local-only "$BEFORE"..HEAD auto-close REFS / 0 origin guards — identical topology to runs 1–9). The published 2-step patch was re-applied byte-identically on local branch fix/issue-1872-workflow-patch → 18eb7695f (7 files, 18 insertions / 13 deletions): grep gates 0 theirs / 8 ours, 0 local / 5 origin REFS + 5 fetch guards, yaml.safe_load 11/11, live rebase harness theirs → 0/45 vs ours → 45/45 (re-measured with the overlapping #1694 scenario: stale side rewrites the file, live side appends 45 lines), no-false-self-close token count (#1872 literal) 0.

Landing routes re-measured (both blocked):

• git push origin HEAD:fix/issue-1872 → ! [remote rejected] … without workflows permission (token minted this run, iat 2026-10-18T02:58Z — 10th consecutive blocked run).
• Contents API (re-measured after run 1): non-workflow probe branch push ACCEPTED, then PUT …/contents/.github/workflows/fix-bug.yml on it → HTTP 403 Resource not accessible by integration — same App permission blocks the API route.

Correction to run 9's "zero bot-authored workflow commits ever": wrong — git log --author=github-actions -- .github/workflows/ shows the bot DID create/update workflow files in August 2026 (82c76c099 add of merge-stale-branches.yml + 8 update commits). The App installation once held the Workflows permission and lost it between Aug 2026 and the early Oct 2026 (bot commit 11f0a9718, 2026-10-05, already reports "the bot token cannot push it"; the issue was filed 2026-10-07). A maintainer re-granting the permission restores the landing route with no code change, after which this branch lands as-is.

Issue stays OPEN (rulebook §7: no fake-close for an unpushed fix). The fix remains one-shot reproducible from §Fix above (or cherry-pick 18eb7695f); gates are re-run after landing, then the issue closes with evidence.

Eleventh consecutive fix-bug run. Bug re-confirmed live on origin/sebiboga @ eb6784477 (8 -X theirs / 0 -X ours; 5 local-only "$BEFORE"..HEAD auto-close REFS / 0 origin guards — identical topology to runs 1–10; measured file:line in the run-11 INVESTIGATION comment on the issue). The published 2-step patch (§Fix above) was re-applied byte-identically on local branch fix/issue-1872-workflow-patch → 4d906b931 (7 files, 18 insertions / 13 deletions):

Landing routes re-measured (both blocked):

• git push origin HEAD:fix/issue-1872 (workflow patch) → ! [remote rejected] … (refusing to allow a GitHub App to create or update workflow .github/workflows/compare-screens.yml without workflows permission) — 11th consecutive blocked run (token minted this run).
• Contents API: a non-workflow probe branch push was ACCEPTED (tmp/api-probe-run11, empty commit, deleted afterwards — git ls-remote origin 'refs/heads/tmp/*' → empty), then PUT …/contents/.github/workflows/fix-bug.yml on it → HTTP 403 Resource not accessible by integration — same App permission blocks the API route.

Landable artifacts pushed: suite entry Regression — Issue #1872 (re-run 2026-10-18, fix-bug run 11, base eb6784477) + this docs section → origin/fix/issue-1872 d97af6346..d2757ca90 (0 .github/ paths, measured — safe for the fallback push to land on the default branch).

Issue stays OPEN (rulebook §7: no fake-close for an unpushed fix). The fix remains one-shot reproducible from §Fix above (or cherry-pick 4d906b931 once a workflows-scoped credential or the re-granted App permission exists); gates are re-run after landing, then the issue closes with evidence.