UPDATE 2026-10-06 00:53 UTC. This supersedes the state described in the sections below wherever the two disagree.

• The user approved merging all six PRs ("Sure, merge all the changes").
• Merged: https://github.com/CodexCoder21Organization/HandoffApi/pull/16 at 00:10 UTC. handoff:api:0.0.26 is now on main.
• HandoffWui PR 33: https://github.com/CodexCoder21Organization/HandoffWui/pull/33 is in the merge queue. It was evicted twice by buildtest infrastructure: a checks timeout, then a createUploadSession failure with 0 tests run. Its queue run is PENDING.
• HandoffApi PR 18: https://github.com/CodexCoder21Organization/HandoffApi/pull/18 was rebased onto main with git rebase --onto origin/main 79fb663 and now carries only its KDoc commit (2752fdd). Its CI was re-requested after an uploadChunk failure and is PENDING. Enqueue it once green.
• HandoffWui PR 34: https://github.com/CodexCoder21Organization/HandoffWui/pull/34 was taken out of the queue because, stacked on 33, it was UNMERGEABLE. Once 33 lands, run git rebase --onto origin/main 2aaaed2, push, and enqueue.
• HandoffEmbedded PR 21: https://github.com/CodexCoder21Organization/HandoffEmbedded/pull/21 is now rebased onto the sibling session's PR 20 head 27b978a. New head 31c6148, version 0.0.32 (not yet published), pins api 0.0.26, 129/129 passing. It adds a secondary constructor that keeps the 0.0.24–0.0.29 Java signature. Once https://github.com/CodexCoder21Organization/HandoffEmbedded/pull/20 merges: confirm the rebase onto main is a no-op, publish 0.0.32, and enqueue.
• HandoffServiceServer PR 29: https://github.com/CodexCoder21Organization/HandoffServiceServer/pull/29 conflicts with main now that the sibling session's SS PR 28 has merged. Rebase it onto main, pin api 0.0.26 and embedded 0.0.32, bump to the next free version, run the full suite, then enqueue.
• Buildtest still starved. See https://github.com/CodexCoder21Organization/PlanRepository/blob/main/challenges/2026-10-05-2113-buildtest-admission-starved-after-2026-10-05-restart.md. Upload failures (createUploadSession/uploadChunk) started at about 00:13 UTC.

Land the Handoff dashboard: merge six reviewed PRs in dependency order once CI is green and the sibling /in-progress chain has landed

Written 2026-10-05 21:45 UTC. RE-VERIFY before acting. Everything below is a snapshot taken when this was written. Re-check every PR with gh pr view <n> --repo CodexCoder21Organization/<repo> --json state,mergeStateStatus,headRefOid,statusCheckRollup and re-check the buildtest queue with curl -s "https://buildtest.kotlin.build/log/raw?id=<runId>" | tail before trusting any state here.

Mission

The user's request, verbatim: "Delegate to opus instead of codex. We want to add a dashboard to https://www.handoff.wasmserver.com/ which will be the default page and which shows the current stats. In particular, it should show charts inspired by https://aiclisupervisor.wasmserver.com/fleet showing relevant stats/history. One of the most important things to track is the progress being made by the various active handoffs. We want to highlight if a claimed handoff or active conversation is blocked. We want to track the which PRs are associated with the handoff/conversation and if the PRs are green or red or merged, and track things like a chart with a line for each active handoff showing the average number of PRs merged per hour over the last hour or last 5 hours or whatever, rolling average or something, the goal is to be able to see visually when a conversation is not making much progress." Later: "continue delegating to opus".

Rules that were in force:

• The session ran as Opus.
• Merging needs the user's explicit approval, which has not been given for any PR yet.
• Deploy to production only if the user explicitly asks; the backend must be deployed before the web interface.

Where it stands

All code is written and reviewed: several adversarial review rounds plus a final review per PR, with failing-first tests and mutation checks. What remains is CI, merges in order, and two rebases.

What happened late in the session:

• A sibling session merged a related feature first. At 19:47–19:53 UTC another session merged its /in-progress page chain: https://github.com/CodexCoder21Organization/HandoffApi/pull/17 (api 0.0.25) and https://github.com/CodexCoder21Organization/HandoffWui/pull/32.
• Our WUI and Api PRs were rebased onto that. A combined handoff:api:0.0.26 was published, containing both the dashboard contract and getWorkInProgressJson.
• The sibling's other two PRs are first in their merge queues: https://github.com/CodexCoder21Organization/HandoffEmbedded/pull/20 and https://github.com/CodexCoder21Organization/HandoffServiceServer/pull/28. Our HandoffEmbedded and HandoffServiceServer PRs must be rebased onto them once they merge, because both implement the shared HandoffService interface, which now has getWorkInProgressJson.
• Buildtest (kotlin.build (remote)) is badly starved, so CI is stuck. Details are under Infrastructure below.

PRs and branches

Merge order:

1. WUI 33
2. Api 16
3. Api 18
4. (sibling Embedded 20 and SS 28 land)
5. rebased Embedded 21
6. rebased SS 29
7. WUI 34

WUI 34 can actually merge once 33 and 16 are in, because its tests use a fixture and real embedded 0.0.29. But it must not be deployed before SS 29.

Merge mechanics: enqueue through the GraphQL enqueuePullRequest mutation (gh pr merge --auto is rejected in these repos). Watch with build-watchman 0.0.21 --to-merged only after the user approves.

Nothing is unpushed. On 2026-10-05 21:44 UTC every checkout under the session scratchpad was swept with git status, git log --branches --not --remotes and git stash list. The only local-only items are:

• the reviewer mutation copies (r4v-*, deliberately modified to prove tests fail; discard them);
• an old pre-rebase PR 16 commit (1a584c0, superseded).

Published but not merged: handoff:api:0.0.24, handoff:api:0.0.26, handoff:embedded:0.0.30 and handoff:embedded:0.0.31 are on kotlin.directory, built from the unmerged branches above.

Deployed: nothing. Production runs whatever main had.

What the change does

• HandoffApi: getDashboardProjectionJson(historyWindowMs) returns open handoffs with claims, conversations, the latest report, report events, linked pull requests (state, checks, merge time) and attention reasons, plus sampled history and a durable merge list.
  • Unknown enum values are preserved, and decodeProblems lists skipped records.
  • addPullRequest and removePullRequest link pull requests to a handoff explicitly.
• HandoffEmbedded:
  • Status reports are scanned for PR links, and the data is kept in an append-only journal plus a snapshot (state.dashboard.json, format v2), compacted when it reaches 256 KB or a day old, with 7-day retention.
  • refreshPullRequestStatesIfDue() (every 2 minutes) queries GitHub GraphQL in batches of 50, with a 30 s deadline, on one dedicated thread that is never interrupted except at close().
  • recordDashboardSampleIfDue() records a sample every 5 minutes.
• HandoffServiceServer: exposes the three methods.
  • Runs the two timed jobs isolated from each other.
  • Its ReconnectingGithubAccountManager opens one session at a time and never closes a session that is in use. Only a caller that failed on that exact session can retire it, each session is closed once, and a caller's own interrupt never retires a session.
  • The history window is capped at 8 days (MAX_DASHBOARD_HISTORY_WINDOW_MS = 691200000): a 7-day range plus a 24-hour rolling window.
• HandoffWui dashboard: tiles, a "Needs attention" list, a rolling merges-per-hour line per handoff (window 1, 5 or 24 hours), history charts, and pull-request chips. The SVG is server-drawn, with no inline script or style, and the layout is responsive.
  • "Stalled" means: currently worked on; worked-since at or before the window start; nothing merged in the window. Worked-since is the earliest live claim, or the earliest active conversation if there is no claim, extended back through status reports no more than DASHBOARD_REPORT_CONTINUITY_GAP_MS (1 hour) apart.
  • Blocked handoffs that meet the rule also count as stalled; the tooltip says so.

Infrastructure: why CI is stuck

Recorded at https://github.com/CodexCoder21Organization/PlanRepository/blob/main/challenges/2026-10-05-2113-buildtest-admission-starved-after-2026-10-05-restart.md.

• Trigger. After a buildtest restart at about 19:40 UTC, SSH dispatch to healthy droplets fails with SshCommandNotExecutedException. The coordinator destroys the droplet but the run keeps its reservation, and admission counts those reservations against the 200-droplet limit.
• Effect. At 21:41, otherGrantedRemainder was 59–68. Our runs a75b5edc (WUI 33), 9982b966 (Api 16), faedc7cd (Api 18) and 7ff552d9 (WUI 34) were still "Waiting for droplet capacity".
• SS 29's run 5946fc98 was admitted, then failed the 10-minute provisioning deadline with 0 tests run. The cause was addSshKeyToDroplet stalling for 30 s, which invalidated the shared droplet-service sandbox connection ("the sandboxed connection was invalidated"). That matches the known UrlResolver behaviour where one deadline retires the whole sandbox instance.
• A restart does not help. Stale reservations clear only when their runs finish or hit the 180-minute deadline (estimated 22:50–23:40 UTC).
• Duplicate queued runs from superseded heads of these PRs also sit in the queue; they were not deleted.

Per the global rules, never accept kotlin.build (remote) red. A failure with 0 tests run and an infrastructure signature is not a code failure. The rebase of SS 29 will start a fresh run anyway.

Next steps

1. Ask the user for merge approval, which has not been given. Once WUI 33, Api 16 and Api 18 are green, ask the user to approve merging them (recommended: yes), then enqueue them in that order.
2. Rebase Embedded 21 when Embedded PR 20 merges.
   • Rebase onto main.
   • Implement or keep getWorkInProgressJson from PR 20 alongside the dashboard code.
   • Pin handoff:api:0.0.26 and bump to the next free embedded version, checking the POM body for <artifactId>.
   • Run the full suite using the fresh-build technique below, then publish.
3. Rebase SS 29 when SS PR 28 merges. Rebase, re-pin api 0.0.26 and the new embedded version, take the next free version, run the full suite, and push.
4. Re-review each rebased diff with an independent reviewer if it changes more than conflict resolution, then do a final review.
5. Land in the merge order above with the user's approval.
6. Deploy only if the user asks: services first (Embedded inside SS), then the WUI.

Reusable knowledge

• Stale builds in tests. HandoffEmbedded's tests load the version under test from ~/.cache/coursier/v1/bldbinary/repository/handoff/embedded/<v>, and scripts/test.bash puts its own --cache-location first. To run the working tree, call jars/KompileCli.jar directly with a fresh cache and delete that bldbinary directory inside the lock. The script is at scratchpad/le2/runfresh.sh in the session scratchpad; recreate it if gone. Prove with a sentinel string before trusting any mutation run.
• Shared test lock. Use flock <scratchpad>/local-suite.lock for local suites. The 16 GB machine is shared, and the disk was at 99% full; clean caches after each run.
• Version probe. Use https://kotlin.directory/handoff/<artifact>/<v>/<artifact>-<v>.pom. It returns 200 even for missing versions, so a version is taken only if the body contains <artifactId>.
• Upstream defect, not yet filed. In UrlResolver foundation.url:resolver:0.0.1263, SandboxedConnection.Companion.expandAndCreate turns a caller's interrupt during sandbox creation into a cause-less SandboxException("Sandbox creation timed out ...") and does not restore the interrupt flag. It should keep the InterruptedException as the cause, restore the flag, and say "timed out" only when its own deadline fired. HandoffServiceServer deliberately does not work around it. The impact is low (shutdown only).
• Known follow-ups.
  • HandoffEmbedded: a GitHub call that never returns stops refreshes until it returns; the fix is a deadline inside the GithubProxy client, upstream.
  • HandoffServiceServer: HandoffGitSyncRunner still catches only Exception.

Report-write phase completed, 2026-10-06 05:31 UTC

RE-VERIFY this scoped result with https://github.com/CodexCoder21Organization/HandoffEmbedded/pull/22 and its remote branch. Lane fxDashRW has finished its assigned root-cause/fix phase and stopped. The supervisor owns every merge, queue and publication decision; the broader dashboard effort remains open. This section supersedes the earlier unresolved report-write notes. Nothing was deployed or published.

The mechanism was full retained-history JSON graph construction followed by per-character BufferedWriter serialization during dashboard compaction. Evidence: the unchanged public report-write scenario failed 9/10 diagnostic runs with four genuine concurrent scenarios, 64-MB heap, SerialGC and unchanged eight-day workload/30000-ms bound; JFR identifies JSONObject.write and BufferedWriter lock release. The deterministic public-API guard restores 30,000 events through the injected filesystem, advances ManualClock to existing daily compaction, and failed 10/10 baseline runs at 7,465,576 bytes allocated before the snapshot sink opened versus a 611,072-byte reference-copy/setup bound.

The fix streams the same schema-v2 snapshot fields through the existing buffered sink. The guard passed 10/10 fixed runs at 262,448 bytes, and the unchanged amplified report-write scenario passed 10/10 at identical settings. Full local suite at exact head 4844cc6af215cb8b118681e650e982415940ba98 passed 131/131 (130 existing plus the new guard), without reattempts. Independent test and code review passes are clean. Journal generations, retention, atomic publication, lifecycle and recovery behavior were retained. No timeout, iteration count or retry was changed.

The first failing regression is https://github.com/CodexCoder21Organization/HandoffEmbedded/commit/40c642267c5c00565e3bf2689c2f17b040e0cb68. Final fetch/rebase was a no-op; ls-remote and the PR mutation response verified the pushed SHA and OPEN state.

Exactly one remote selector request https://buildtest.kotlin.build/run?id=1aac2907 completed with eight passed, zero failed. All eight canonical selected tests have canonicalAttemptNumber=1, highestAttemptNumber=1 and flaky=false, across both API pages/131 rows; 123 FILTERED_OUT rows are excluded. The new guard passed in 21422 ms and unchanged report-write in 29407 ms. The client reached its existing 1800000-ms request-wait limit after a long capacity queue, but the service completed the build/tests and destroyed the worker. The verdict comes from actual executed canonical results, not that client exit code. No second request was made.

Tool findings for the supervisor: build-watchman 0.0.18 counts filtered-out rows as completed and reads only the first 100 rows, producing a false stale-run warning for this selector run. gh pr edit failed with Projects-classic projectCards deprecation; the REST PATCH succeeded and its exact body/head were verified. report-challenge CLI was not invoked because it automatically enqueues and merges, prohibited in this lane. The owned watchman was stopped; no foreign process or queue entry was changed.

Scoped phase is DONE. Supervisor next: independently review the pushed fix and use its own normal CI/merge/publication gates. This lane did not wait on new branch CI, enqueue, merge, publish, deploy, or archive this broader handoff.