chore(desktop): keep the lint run away from build output

apps/desktop/oxfmt.config.ts

@@ -9,5 +9,9 @@ export default defineConfig({
     "**/src-host/**",
     "**/assets/**/*.json",
     "**/artifacts/**",
+    // Build outputs are gitignored but not written by hand: `oxfmt --check .` walks the tree, so
+    // leaving them out formats the bundled renderer (tens of MB) on every lint run.
+    "**/dist/**",
+    "**/build/**",
   ],
 });

docs/sdlc/changes/2026-09-16-lint-ignore-build-output/intent.md

@@ -0,0 +1,42 @@
+---
+id: 2026-09-16-lint-ignore-build-output
+schema: 5
+stage: intent
+status: accepted
+owner: chenli
+created: 2026-09-16
+source: user
+risk: low
+approved_by: chenli
+approved_at: 2026-09-16
+approval_source: "Direct request: pr, answering the offer to fix the lint hang caused by build output."
+next_trigger: chenli reviews the verified work.
+---
+
+# Intent: Keep the lint run away from build output
+
+## Intent
+
+`bun run lint` (`ultracite check`) hangs or crashes whenever `apps/desktop/dist/` exists. The dev
+watcher rebuilds that directory on every source edit, so the failure appears at random during
+ordinary development: the run burns CPU for minutes and then reports an error over the bundled
+renderer's embedded xterm banner.
+
+Cause, verified on the live checkout: ultracite runs `oxlint .` and `oxfmt --check .`; `oxlint`
+honours this repo's `ignorePatterns` (`dist/**`, `build/**`, `artifacts/**`, `node_modules/**`) and
+finishes in seconds, while `apps/desktop/oxfmt.config.ts` only ignores `src-tauri/gen`, `src-host`,
+asset JSON and `artifacts`. So the formatter walks the ~48 MB bundled renderer (including a 5 MB
+vendor bundle) on every lint run.
+
+Outcome: `bun run lint` and `bun run build:renderer` stay fast and green whether or not a build
+output directory exists.
+
+Constraints: the ignore list grows only by the project's own build directories; no rule, file list,
+or formatting behaviour changes for maintained source.
+
+Non-goals: changing what ultracite checks, adding a lint configuration, or removing build output
+cleanup from any script.
+
+## Non-goals
+
+No new lint rule, no change to the maintained file set, and no product code.

docs/sdlc/changes/2026-09-16-lint-ignore-build-output/plan.md

@@ -0,0 +1,26 @@
+---
+id: 2026-09-16-lint-ignore-build-output
+schema: 5
+stage: plan
+status: accepted
+owner: chenli
+created: 2026-09-16
+based_on: spec.md
+scope: apps/desktop/oxfmt.config.ts, docs/sdlc/changes/2026-09-16-lint-ignore-build-output
+---
+
+# Plan: Keep the lint run away from build output
+
+## Plan
+
+1. `apps/desktop/oxfmt.config.ts` — add `**/dist/**` and `**/build/**` to `ignorePatterns` with the
+   reason in a comment. (AC-1, AC-3)
+2. Reproduce the state the watcher leaves behind (`apps/desktop/dist/` present) and run the two
+   affected commands: `bun run lint` and `bun run build:renderer`. (AC-1, AC-2)
+3. Confirm the maintained verdict is unchanged by running the same pair again after the fix and
+   comparing with the earlier passing runs in this session.
+
+Temporary resources: the ignored `apps/desktop/dist/` output that `build:renderer` recreates is
+removed before handoff; no other scratch is created.
+
+Rollback: revert the two added lines; no source, script, or rule depends on them.

docs/sdlc/changes/2026-09-16-lint-ignore-build-output/spec.md

@@ -0,0 +1,27 @@
+---
+id: 2026-09-16-lint-ignore-build-output
+schema: 5
+stage: spec
+status: accepted
+owner: chenli
+created: 2026-09-16
+based_on: intent.md
+---
+
+# Spec: Keep the lint run away from build output
+
+## Design
+
+`apps/desktop/oxfmt.config.ts` gains two ignore patterns beside the ones it already carries:
+`**/dist/**` (the renderer build output, including the `dist-web` web build) and `**/build/**` (the
+Electrobun app bundle tree). The comment beside them records why: the formatter walks the tree, so
+an unignored bundle of tens of megabytes is formatted on every lint run. `oxlint.config.ts` already
+ignores the same directories and is unchanged.
+
+## Acceptance criteria
+
+- [x] AC-1: With `apps/desktop/dist/` present, `bun run lint` finishes in seconds and reports the
+  maintained files only.
+- [x] AC-2: `bun run build:renderer` (lint + tsc + vite build) passes with a previous `dist/`
+  present, which is the state the dev watcher leaves behind.
+- [x] AC-3: No maintained source file's formatting verdict changes.

docs/sdlc/changes/2026-09-16-lint-ignore-build-output/verification.md

@@ -0,0 +1,48 @@
+---
+id: 2026-09-16-lint-ignore-build-output
+schema: 5
+stage: verification
+status: passed
+owner: chenli
+created: 2026-09-16
+based_on: plan.md
+revision: "833ecb8b (main) with the lint-ignore-build-output change applied"
+verification_mode: owner
+verified_by: chenli
+verified_at: 2026-09-16
+release_target: none
+cleanup_status: complete
+---
+
+# Verification: Keep the lint run away from build output
+
+## Verification
+
+- AC-1: PASS — With `apps/desktop/dist/` present (48 MB, including the 5 MB vendor bundle), `bun run lint` finished in 8.8 s and reported `All matched files use the correct format.` on 515 files. Before the change the same command with that directory present never returned: three attempts hit the agent's tool timeouts (300 s, 420 s, 600 s) while `oxlint`/`oxfmt` burned a core.
+- AC-2: PASS — `bun run build:renderer` (lint, then `tsc --noEmit`, then the Vite build) completed with a previous `dist/` present: `All matched files use the correct format.` followed by `✓ built in 24.04s`, 39.6 s wall including the bundle.
+- AC-3: PASS — The maintained verdict is unchanged from the earlier clean-tree runs in this session: `ultracite check src tests` reports `All matched files use the correct format.` on 475 files, and the full `bun run lint` reports the same on 515.
+
+Verdict: verified.
+Residual risk: the two ignored directories are the project's own gitignored outputs; a future build
+directory with another name would need its own pattern. `oxfmt` still spends a few seconds walking
+the ignored tree (8.8 s versus the 0.2 s clean-tree run), which is acceptable and far cheaper than
+formatting the bundle.
+
+## Cleanup
+
+Removed: the ignored `apps/desktop/dist/` output recreated for the AC-2 check.
+Retained: none.
+Processes: none started or left behind; the user's dev window and the other worktrees' servers were
+not touched.
+Evidence: `git status --porcelain` lists only the config file plus this record bundle after cleanup.
+
+## Review and release
+
+Approval: the fix and its PR were requested directly by the user (pr); merge and release are not
+authorized.
+Rollback: See plan.md.
+Release: No release requested; merge and external actions require their own authorization.
+Review: [PR #240](https://github.com/IchenDEV/codeTwo/pull/240) carries this change on branch
+t3code/lint-ignore-build-output, based on main 833ecb8b; the hosted CI Validate job passed (run
+35086020084, job 104760912876, 2m58s).
+Feedback: Link an Incident and regression Eval when a real failure occurs.