[henrychu04]

Stage 5 of the 67661cf → upstream sync: the remaining 63 commits, up to upstream's tip 6d450a4.

Brings:

• Turn a No-project thread into a project (feat: turn a No project thread into a project pingdotgg/t3code#26767). projects.createFromThread is in CoderWsRpcGroup, and the helper advertises threadProjectFromScratch.
• A faster long-thread timeline (perf(web): long-thread timeline rebuilds 45 → 9 ms, tool updates 12 → 0.3 ms pingdotgg/t3code#26727).
• Choose what the thread details card shows (feat(web): choose what the thread details card shows pingdotgg/t3code#26904). The fork has no Open in, Servers or Usage items.
• The undo notice moves to the sidebar footer (fix(web): undo notice moves to the sidebar footer so it never covers a thread pingdotgg/t3code#26874).
• The PR diff follows the file tree and has a hide-tests filter (fix(web): pull request diff follows the file tree, with a hide-tests filter pingdotgg/t3code#26730).
• Folder threads can show on two lines (feat(web): boring sidebar can show folder threads on two lines pingdotgg/t3code#26463).
• Claude's Open diff shows Claude's edits as a diff instead of raw JSON (fix(claude): Open diff shows Claude edits as a diff instead of raw JSON pingdotgg/t3code#26529). It adds the diff dependency.
• Command approvals show the command (fix(claude): command approvals show the command, not Claude's description of it pingdotgg/t3code#20145).
• Local git status is published before the remote lookup (fix(server): publish local git status before remote lookup pingdotgg/t3code#21046).
• Smaller fixes: fix(web): chat tables open at the right size instead of collapsed and cut off pingdotgg/t3code#26449, fix(web): double-click selects the whole inline code span pingdotgg/t3code#26639, fix(web): image chips drop the pill and match other chips pingdotgg/t3code#26379, fix(web): numbered composer lists nest and lift correctly pingdotgg/t3code#17138, fix(web): keep tool groups collapsed after a usage-limit pause pingdotgg/t3code#24937, fix(web): keep settled drop hint inside the sidebar viewport pingdotgg/t3code#26736, fix(mobile): delivered messages no longer reappear at the bottom of long threads pingdotgg/t3code#26739, fix(server): outside MCP clients get thread links they can open pingdotgg/t3code#26642, fix(server): searching delegate models by provider name no longer shows only dead models pingdotgg/t3code#26448, feat(server): agents list snoozed threads across all projects in one call pingdotgg/t3code#26442, fix(server): release completed pull request sweep data pingdotgg/t3code#25177, fix(acp): ID-only command approvals keep the tracked command and grant the terminal pingdotgg/t3code#26647, chore: make agent mistakes fail early pingdotgg/t3code#26167.
• Remote delegates show their harness icon and a parent row (fix(web): remote delegates show their harness icon, a parent row, and new links in settings pingdotgg/t3code#26434). This applies to the gateway hub's linked workspaces.
• The license script now matches upstream's, which commits the SPDX texts (fix(build): builds no longer fail when GitHub's CDN times out on license templates pingdotgg/t3code#26440).

Cut:

• feat(server,web,mobile): fall back when the default provider is out of usage pingdotgg/t3code#26164, fall back when the default provider is out of usage. It needs the usage-limit windows the fork deleted, and it only fires on plan-window usage. fallbackModelSelection stays in the settings schema only.
• Devices and Simlock (feat(devices): lease simulators and emulators from a Simlock pool (alpha) pingdotgg/t3code#25259, feat(devices): Simlock setup uses each machine's agent-device token, checks tokens, and lists the pool through worker reconnects pingdotgg/t3code#26706, fix(server): agents drive simulators through the device tools instead of ssh pingdotgg/t3code#25661).
• GitHub maintainer edits UI (feat(pull-requests): manage GitHub maintainer edits pingdotgg/t3code#25588). Its optional contract and PullRequestService fields merged and only act when a host advertises maintainer edits, which GitLab never does.
• Antigravity, Cursor, OpenCode and Copilot surfaces (feat(antigravity): Claude and GPT models, thinking levels, and diff edits pingdotgg/t3code#26876, fix(antigravity): file reads no longer show unrelated errors pingdotgg/t3code#26910, fix(antigravity): served reads stop spinning and duplicate model names are labeled pingdotgg/t3code#26928, fix(web): Antigravity effort no longer shows a speedometer in the composer pingdotgg/t3code#26929, fix(cursor): subagent ls, lint and MCP results no longer fail the parent run pingdotgg/t3code#26592, and fix(server): queue Copilot follow-ups without killing background agents pingdotgg/t3code#26715's Copilot override).
• Updates and releases: fleet update tracks (feat(updates): switch your whole fleet between Stable and Nightly in one step pingdotgg/t3code#26288), update everything (fix(web): update everything no longer waits on npm for service hosts pingdotgg/t3code#26917, test(web): pin the npm wait floor for update everything pingdotgg/t3code#26921), and release notes (feat(release): release notes and the update popover open with a short note pingdotgg/t3code#26893).
• feat(web): Labs toggle keeps 5h, weekly, and context limits in view pingdotgg/t3code#26859 Labs plan limits.
• Mobile, desktop, release and CI.

Sync tooling:

• scripts/sync-resolve-deleted.mjs covers the 56 deleted paths this stage hit.
• knip ignores the mobile-only threadState.ts export.
• The seams doc lists the new cuts and seams.

Verification:

• pnpm test:coder (TMPDIR under /private/tmp) passes in full.
• pnpm build passes.
• Every AGENTS.md typecheck passes.
• pnpm knip:check, pnpm test:knip, vp fmt --check, the unused-locals check and pnpm install --frozen-lockfile pass.
• The §6 checks pass: every marker change and lacking line is one of the cuts or seams above.
• The helper bundle boots in a linux/amd64 node:24-bookworm-slim container.
• Live, against two real Coder workspaces with the gateway hub and a fake Kilo agent:
  • A delegates to B and gets B's answer.
  • Without a link rule, A's call is refused.
  • A read-only link refuses the launch in B.
  • task_cancel interrupts B's run.
  • Switching Labs off and on in B mid-task: the task finishes.
  • After a gateway restart, the task waits for B, then settles with B's outcome.

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