diff --git a/.claude/settings.json b/.claude/settings.json
index a52e93d..66385c2 100644
--- a/.claude/settings.json
+++ b/.claude/settings.json
@@ -4,7 +4,7 @@
       "source": {
         "source": "github",
         "repo": "LasVegasForTransit/repository-tooling",
-        "ref": "v0.4.1"
+        "ref": "v0.4.2"
       }
     }
   },
diff --git a/.gitignore b/.gitignore
index 39d43f7..65717d9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,3 +13,5 @@ blob-report/
 .dev.vars
 .dev.vars.*
 .DS_Store
+# Agent worktrees are other checkouts of this repository.
+.claude/worktrees/
diff --git a/.lvbt/web-platform.json b/.lvbt/web-platform.json
index 8306138..77f4dc8 100644
--- a/.lvbt/web-platform.json
+++ b/.lvbt/web-platform.json
@@ -1,9 +1,9 @@
 {
   "formatVersion": 1,
   "preset": "lvbt-web",
-  "release": "v0.4.1",
-  "commit": "0577d597f03f1036d49c497a5424ec643b75c5d1",
-  "contentHash": "15acec6a3332eb5a2817da55147a740549eea1b921c5dbc640658cc6226ea224",
+  "release": "v0.4.2",
+  "commit": "a841b8c34d20cb3f1ff6130213ca75d561e0ddb8",
+  "contentHash": "53052f1d6e00b590f189da7c7edc70210ca4ea4f09a4972ca94bb0a3351910b7",
   "executables": [
     "examples/with-astro/.githooks/commit-msg",
     "examples/with-astro/.githooks/pre-commit",
diff --git a/.lvbt/web-platform/examples/with-astro/.claude/settings.json b/.lvbt/web-platform/examples/with-astro/.claude/settings.json
index a52e93d..66385c2 100644
--- a/.lvbt/web-platform/examples/with-astro/.claude/settings.json
+++ b/.lvbt/web-platform/examples/with-astro/.claude/settings.json
@@ -4,7 +4,7 @@
       "source": {
         "source": "github",
         "repo": "LasVegasForTransit/repository-tooling",
-        "ref": "v0.4.1"
+        "ref": "v0.4.2"
       }
     }
   },
diff --git a/.lvbt/web-platform/examples/with-astro/.gitignore b/.lvbt/web-platform/examples/with-astro/.gitignore
index c65b6f7..4cf35a7 100644
--- a/.lvbt/web-platform/examples/with-astro/.gitignore
+++ b/.lvbt/web-platform/examples/with-astro/.gitignore
@@ -13,4 +13,6 @@ blob-report/
 .dev.vars
 .dev.vars.*
 .DS_Store
+# Agent worktrees are other checkouts of this repository.
+.claude/worktrees/
 .astro/
diff --git a/.lvbt/web-platform/examples/with-astro/.markdownlint-cli2.jsonc b/.lvbt/web-platform/examples/with-astro/.markdownlint-cli2.jsonc
index 350e5df..d49cf21 100644
--- a/.lvbt/web-platform/examples/with-astro/.markdownlint-cli2.jsonc
+++ b/.lvbt/web-platform/examples/with-astro/.markdownlint-cli2.jsonc
@@ -13,6 +13,7 @@
     // Playwright output.
     "**/test-results",
     "**/playwright-report",
+    // Agent worktrees are other checkouts of this repository.
     ".claude/worktrees",
     "node_modules",
     "**/node_modules",
diff --git a/.lvbt/web-platform/examples/with-astro/apps/site/package.json b/.lvbt/web-platform/examples/with-astro/apps/site/package.json
index fa04257..fa11539 100644
--- a/.lvbt/web-platform/examples/with-astro/apps/site/package.json
+++ b/.lvbt/web-platform/examples/with-astro/apps/site/package.json
@@ -21,10 +21,10 @@
   },
   "devDependencies": {
     "@astrojs/check": "catalog:",
-    "@lasvegasfortransit/eslint-config": "0.4.1",
-    "@lasvegasfortransit/playwright-config": "0.4.1",
-    "@lasvegasfortransit/typescript-config": "0.4.1",
-    "@lasvegasfortransit/vitest-config": "0.4.1",
+    "@lasvegasfortransit/eslint-config": "0.4.2",
+    "@lasvegasfortransit/playwright-config": "0.4.2",
+    "@lasvegasfortransit/typescript-config": "0.4.2",
+    "@lasvegasfortransit/vitest-config": "0.4.2",
     "@playwright/test": "catalog:",
     "@types/node": "catalog:",
     "eslint": "catalog:",
diff --git a/.lvbt/web-platform/examples/with-astro/package.json b/.lvbt/web-platform/examples/with-astro/package.json
index 4faf64f..674f08f 100644
--- a/.lvbt/web-platform/examples/with-astro/package.json
+++ b/.lvbt/web-platform/examples/with-astro/package.json
@@ -23,8 +23,8 @@
     "*": "prettier --write --ignore-unknown"
   },
   "devDependencies": {
-    "@lasvegasfortransit/cli": "0.4.1",
-    "@lasvegasfortransit/prettier-config": "0.4.1",
+    "@lasvegasfortransit/cli": "0.4.2",
+    "@lasvegasfortransit/prettier-config": "0.4.2",
     "lint-staged": "catalog:",
     "markdownlint-cli2": "catalog:",
     "markdownlint-rule-relative-links": "catalog:",
diff --git a/.lvbt/web-platform/examples/with-vite-react/.claude/settings.json b/.lvbt/web-platform/examples/with-vite-react/.claude/settings.json
index a52e93d..66385c2 100644
--- a/.lvbt/web-platform/examples/with-vite-react/.claude/settings.json
+++ b/.lvbt/web-platform/examples/with-vite-react/.claude/settings.json
@@ -4,7 +4,7 @@
       "source": {
         "source": "github",
         "repo": "LasVegasForTransit/repository-tooling",
-        "ref": "v0.4.1"
+        "ref": "v0.4.2"
       }
     }
   },
diff --git a/.lvbt/web-platform/examples/with-vite-react/.gitignore b/.lvbt/web-platform/examples/with-vite-react/.gitignore
index 39d43f7..65717d9 100644
--- a/.lvbt/web-platform/examples/with-vite-react/.gitignore
+++ b/.lvbt/web-platform/examples/with-vite-react/.gitignore
@@ -13,3 +13,5 @@ blob-report/
 .dev.vars
 .dev.vars.*
 .DS_Store
+# Agent worktrees are other checkouts of this repository.
+.claude/worktrees/
diff --git a/.lvbt/web-platform/examples/with-vite-react/.markdownlint-cli2.jsonc b/.lvbt/web-platform/examples/with-vite-react/.markdownlint-cli2.jsonc
index 350e5df..d49cf21 100644
--- a/.lvbt/web-platform/examples/with-vite-react/.markdownlint-cli2.jsonc
+++ b/.lvbt/web-platform/examples/with-vite-react/.markdownlint-cli2.jsonc
@@ -13,6 +13,7 @@
     // Playwright output.
     "**/test-results",
     "**/playwright-report",
+    // Agent worktrees are other checkouts of this repository.
     ".claude/worktrees",
     "node_modules",
     "**/node_modules",
diff --git a/.lvbt/web-platform/examples/with-vite-react/apps/app/package.json b/.lvbt/web-platform/examples/with-vite-react/apps/app/package.json
index 3f7af88..4d4d4e9 100644
--- a/.lvbt/web-platform/examples/with-vite-react/apps/app/package.json
+++ b/.lvbt/web-platform/examples/with-vite-react/apps/app/package.json
@@ -17,10 +17,10 @@
     "react-dom": "catalog:"
   },
   "devDependencies": {
-    "@lasvegasfortransit/eslint-config": "0.4.1",
-    "@lasvegasfortransit/playwright-config": "0.4.1",
-    "@lasvegasfortransit/typescript-config": "0.4.1",
-    "@lasvegasfortransit/vitest-config": "0.4.1",
+    "@lasvegasfortransit/eslint-config": "0.4.2",
+    "@lasvegasfortransit/playwright-config": "0.4.2",
+    "@lasvegasfortransit/typescript-config": "0.4.2",
+    "@lasvegasfortransit/vitest-config": "0.4.2",
     "@playwright/test": "catalog:",
     "@tailwindcss/vite": "catalog:",
     "@types/node": "catalog:",
diff --git a/.lvbt/web-platform/examples/with-vite-react/package.json b/.lvbt/web-platform/examples/with-vite-react/package.json
index fef1d39..ec61ba8 100644
--- a/.lvbt/web-platform/examples/with-vite-react/package.json
+++ b/.lvbt/web-platform/examples/with-vite-react/package.json
@@ -23,8 +23,8 @@
     "*": "prettier --write --ignore-unknown"
   },
   "devDependencies": {
-    "@lasvegasfortransit/cli": "0.4.1",
-    "@lasvegasfortransit/prettier-config": "0.4.1",
+    "@lasvegasfortransit/cli": "0.4.2",
+    "@lasvegasfortransit/prettier-config": "0.4.2",
     "lint-staged": "catalog:",
     "markdownlint-cli2": "catalog:",
     "markdownlint-rule-relative-links": "catalog:",
diff --git a/.lvbt/web-platform/packages/cli/package.json b/.lvbt/web-platform/packages/cli/package.json
index 4ac27de..db4c149 100644
--- a/.lvbt/web-platform/packages/cli/package.json
+++ b/.lvbt/web-platform/packages/cli/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@lasvegasfortransit/cli",
-  "version": "0.4.1",
+  "version": "0.4.2",
   "description": "The lvbt command every LVBT repository runs for bootstrap, preflight, and deploy, plus the production platform setup, the shared git hooks, and the lvbt-contributions agent plugin.",
   "license": "MIT",
   "type": "module",
diff --git a/.lvbt/web-platform/packages/cli/plugins/lvbt-contributions/.claude-plugin/plugin.json b/.lvbt/web-platform/packages/cli/plugins/lvbt-contributions/.claude-plugin/plugin.json
index b22e557..ec6bfc2 100644
--- a/.lvbt/web-platform/packages/cli/plugins/lvbt-contributions/.claude-plugin/plugin.json
+++ b/.lvbt/web-platform/packages/cli/plugins/lvbt-contributions/.claude-plugin/plugin.json
@@ -1,6 +1,6 @@
 {
   "name": "lvbt-contributions",
-  "version": "0.4.1",
+  "version": "0.4.2",
   "description": "Create readable LVBT GitHub issues and pull requests through the organization workflow.",
   "author": {
     "name": "Las Vegans for Better Transit",
diff --git a/.lvbt/web-platform/packages/cli/plugins/lvbt-contributions/.codex-plugin/plugin.json b/.lvbt/web-platform/packages/cli/plugins/lvbt-contributions/.codex-plugin/plugin.json
index 61b8939..90dfb61 100644
--- a/.lvbt/web-platform/packages/cli/plugins/lvbt-contributions/.codex-plugin/plugin.json
+++ b/.lvbt/web-platform/packages/cli/plugins/lvbt-contributions/.codex-plugin/plugin.json
@@ -1,6 +1,6 @@
 {
   "name": "lvbt-contributions",
-  "version": "0.4.1",
+  "version": "0.4.2",
   "description": "Create readable LVBT GitHub issues and pull requests through the organization workflow.",
   "author": {
     "name": "Las Vegans for Better Transit",
diff --git a/.lvbt/web-platform/packages/eslint-config/package.json b/.lvbt/web-platform/packages/eslint-config/package.json
index 85cc902..0b38946 100644
--- a/.lvbt/web-platform/packages/eslint-config/package.json
+++ b/.lvbt/web-platform/packages/eslint-config/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@lasvegasfortransit/eslint-config",
-  "version": "0.4.1",
+  "version": "0.4.2",
   "description": "The ESLint configurations every LVBT repository uses.",
   "license": "MIT",
   "type": "module",
diff --git a/.lvbt/web-platform/packages/playwright-config/package.json b/.lvbt/web-platform/packages/playwright-config/package.json
index 7293bfd..e661590 100644
--- a/.lvbt/web-platform/packages/playwright-config/package.json
+++ b/.lvbt/web-platform/packages/playwright-config/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@lasvegasfortransit/playwright-config",
-  "version": "0.4.1",
+  "version": "0.4.2",
   "description": "The Playwright configuration every LVBT repository spreads into its own: end-to-end tests under tests/e2e, desktop and mobile projects, traces on failure.",
   "license": "MIT",
   "type": "module",
diff --git a/.lvbt/web-platform/packages/prettier-config/package.json b/.lvbt/web-platform/packages/prettier-config/package.json
index d4e8107..663e7c7 100644
--- a/.lvbt/web-platform/packages/prettier-config/package.json
+++ b/.lvbt/web-platform/packages/prettier-config/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@lasvegasfortransit/prettier-config",
-  "version": "0.4.1",
+  "version": "0.4.2",
   "description": "The Prettier configuration every LVBT repository uses.",
   "license": "MIT",
   "type": "module",
diff --git a/.lvbt/web-platform/packages/typescript-config/package.json b/.lvbt/web-platform/packages/typescript-config/package.json
index e412c38..4a81b2d 100644
--- a/.lvbt/web-platform/packages/typescript-config/package.json
+++ b/.lvbt/web-platform/packages/typescript-config/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@lasvegasfortransit/typescript-config",
-  "version": "0.4.1",
+  "version": "0.4.2",
   "description": "TypeScript configurations every LVBT repository extends.",
   "license": "MIT",
   "repository": {
diff --git a/.lvbt/web-platform/packages/vitest-config/package.json b/.lvbt/web-platform/packages/vitest-config/package.json
index 5a1f31b..34631ae 100644
--- a/.lvbt/web-platform/packages/vitest-config/package.json
+++ b/.lvbt/web-platform/packages/vitest-config/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@lasvegasfortransit/vitest-config",
-  "version": "0.4.1",
+  "version": "0.4.2",
   "description": "The Vitest configuration every LVBT repository spreads into its own.",
   "license": "MIT",
   "type": "module",
diff --git a/.lvbt/web-platform/packages/web-platform/package.json b/.lvbt/web-platform/packages/web-platform/package.json
index d78fd49..f97e022 100644
--- a/.lvbt/web-platform/packages/web-platform/package.json
+++ b/.lvbt/web-platform/packages/web-platform/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@lasvegasfortransit/web-platform",
-  "version": "0.4.1",
+  "version": "0.4.2",
   "description": "Provider-neutral deployment, provisioning, and validation primitives for LVBT web repositories.",
   "license": "MIT",
   "type": "module",
diff --git a/.lvbt/web-platform/standards/consumer-ignores.ts b/.lvbt/web-platform/standards/consumer-ignores.ts
new file mode 100644
index 0000000..37f1fec
--- /dev/null
+++ b/.lvbt/web-platform/standards/consumer-ignores.ts
@@ -0,0 +1,179 @@
+import { readFile, writeFile } from 'node:fs/promises';
+import path from 'node:path';
+
+// Playwright writes these beside each app's configuration, such as apps/site/test-results/.
+// Every example's .gitignore carries the same rules. A slash inside a pattern anchors it to the
+// .gitignore's own directory, so the cache rule needs its leading **/ to reach every app.
+export const PLAYWRIGHT_OUTPUT_IGNORES = [
+  'test-results/',
+  'playwright-report/',
+  'blob-report/',
+  '**/playwright/.cache/',
+];
+
+// Claude Code creates each agent worktree, a full checkout of the same repository on another
+// branch, under .claude/worktrees/ inside the checkout. Git, Prettier, and markdownlint would
+// otherwise treat another session's files as this repository's own.
+export const AGENT_WORKTREES = '.claude/worktrees';
+const AGENT_WORKTREES_REASON = 'Agent worktrees are other checkouts of this repository.';
+
+/** The rules each root ignore file must hold, as the examples hold them. */
+const LINE_RULES: Record<string, string[]> = {
+  '.gitignore': [...PLAYWRIGHT_OUTPUT_IGNORES, `${AGENT_WORKTREES}/`],
+  '.prettierignore': [`${AGENT_WORKTREES}/`],
+};
+
+const MARKDOWNLINT_CONFIG = '.markdownlint-cli2.jsonc';
+
+/**
+ * Adds the standard's ignore rules that a consumer's root ignore files lack, leaving their own
+ * lines, comments, and order untouched. A file the consumer doesn't have stays absent.
+ */
+export async function syncConsumerIgnores(root: string, dryRun: boolean): Promise<string[]> {
+  const changed: string[] = [];
+  for (const [name, rules] of Object.entries(LINE_RULES)) {
+    if (await appendMissingLines(path.join(root, name), rules, dryRun)) changed.push(name);
+  }
+  const file = path.join(root, MARKDOWNLINT_CONFIG);
+  const source = await readFile(file, 'utf8').catch(() => null);
+  if (source !== null) {
+    const next = addMarkdownlintIgnore(source, AGENT_WORKTREES, AGENT_WORKTREES_REASON);
+    if (next !== source) {
+      if (!dryRun) await writeFile(file, next);
+      changed.push(MARKDOWNLINT_CONFIG);
+    }
+  }
+  return changed;
+}
+
+async function appendMissingLines(file: string, rules: string[], dryRun: boolean) {
+  const source = await readFile(file, 'utf8').catch(() => null);
+  if (source === null) return false;
+  const present = new Set(source.split(/\r?\n/).map((line) => line.trim()));
+  const missing = rules.filter((rule) => !present.has(rule));
+  if (missing.length === 0) return false;
+  const separator = source === '' || source.endsWith('\n') ? '' : '\n';
+  if (!dryRun) await writeFile(file, `${source}${separator}${missing.join('\n')}\n`);
+  return true;
+}
+
+interface Token {
+  text: string;
+  value?: string;
+  start: number;
+  end: number;
+}
+
+/** Where the comment that starts at `index` ends, or `index` when none starts there. */
+function commentEnd(source: string, index: number): number {
+  if (source.startsWith('//', index)) {
+    const end = source.indexOf('\n', index);
+    return end === -1 ? source.length : end;
+  }
+  if (!source.startsWith('/*', index)) return index;
+  const end = source.indexOf('*/', index + 2);
+  if (end === -1) throw new Error(`${MARKDOWNLINT_CONFIG} has an unclosed comment.`);
+  return end + 2;
+}
+
+function stringToken(source: string, start: number): Token {
+  let end = start + 1;
+  while (end < source.length && source[end] !== '"') end += source[end] === '\\' ? 2 : 1;
+  if (end >= source.length) throw new Error(`${MARKDOWNLINT_CONFIG} has an unclosed string.`);
+  const text = source.slice(start, end + 1);
+  return { text, value: JSON.parse(text) as string, start, end: end + 1 };
+}
+
+/** A punctuation mark, or a literal such as `true` or `100`. */
+function otherToken(source: string, start: number): Token {
+  const character = source.charAt(start);
+  if ('{}[]:,'.includes(character)) return { text: character, start, end: start + 1 };
+  let end = start;
+  while (end < source.length && !/[\s{}[\]:,"/]/.test(source.charAt(end))) end += 1;
+  if (end === start) throw new Error(`${MARKDOWNLINT_CONFIG} is not valid JSONC.`);
+  return { text: source.slice(start, end), start, end };
+}
+
+/** The strings, punctuation, and literals of a JSONC document, without whitespace or comments. */
+function tokenize(source: string): Token[] {
+  const tokens: Token[] = [];
+  let index = 0;
+  while (index < source.length) {
+    const skipped = /\s/.test(source.charAt(index)) ? index + 1 : commentEnd(source, index);
+    if (skipped !== index) {
+      index = skipped;
+      continue;
+    }
+    const token = source[index] === '"' ? stringToken(source, index) : otherToken(source, index);
+    tokens.push(token);
+    index = token.end;
+  }
+  return tokens;
+}
+
+const NESTING = new Map([
+  ['{', 1],
+  ['[', 1],
+  ['}', -1],
+  [']', -1],
+]);
+
+/** The `[` that opens the top-level `key` array and every token after it, if there is one. */
+function topLevelArray(tokens: Token[], key: string): { open: Token; rest: Token[] } | undefined {
+  let depth = 0;
+  for (const [index, { text, value }] of tokens.entries()) {
+    const open = tokens[index + 2];
+    if (depth === 1 && value === key && tokens[index + 1]?.text === ':' && open?.text === '[')
+      return { open, rest: tokens.slice(index + 3) };
+    depth += NESTING.get(text) ?? 0;
+  }
+  return undefined;
+}
+
+/** Whether an array holds `value` as one of its own entries, given the tokens after its `[`. */
+function arrayHolds(rest: Token[], value: string): boolean {
+  let depth = 0;
+  for (const token of rest) {
+    depth += NESTING.get(token.text) ?? 0;
+    if (depth < 0) return false;
+    if (depth === 0 && token.value === value) return true;
+  }
+  return false;
+}
+
+/** The whitespace that starts the first line after `offset` holding anything else. */
+function nextIndentation(source: string, offset: number): { indentation: string; closes: boolean } {
+  const match = /\n([ \t]*)(\S)/.exec(source.slice(offset));
+  return { indentation: match?.[1] ?? '', closes: match?.[2] === ']' || match?.[2] === '}' };
+}
+
+/**
+ * Adds `glob` to the top-level `ignores` array of a markdownlint-cli2 configuration, with `reason`
+ * as a comment above it. The entry goes first in the array; every existing entry, comment, and
+ * blank line stays where it was. A configuration without `ignores` gets the array.
+ */
+export function addMarkdownlintIgnore(source: string, glob: string, reason: string): string {
+  const tokens = tokenize(source);
+  const [first] = tokens;
+  if (first?.text !== '{') throw new Error(`${MARKDOWNLINT_CONFIG} must hold one object.`);
+  const ignores = topLevelArray(tokens, 'ignores');
+  if (!ignores) {
+    const entry = `"ignores": [${JSON.stringify(glob)}],`;
+    return insertAfter(source, first.end, `// ${reason}`, entry);
+  }
+  if (arrayHolds(ignores.rest, glob)) return source;
+  return insertAfter(source, ignores.open.end, `// ${reason}`, `${JSON.stringify(glob)},`);
+}
+
+/**
+ * Inserts `entry` right after `offset`: on its own line below a `// comment`, indented like the
+ * line that follows, or ahead of the next entry when the bracket's contents share its line.
+ */
+function insertAfter(source: string, offset: number, comment: string, entry: string): string {
+  const before = source.slice(0, offset);
+  const after = source.slice(offset);
+  if (!/^[ \t]*\r?\n/.test(after)) return `${before}${entry} ${after.trimStart()}`;
+  const { indentation, closes } = nextIndentation(source, offset);
+  const indent = closes ? `${indentation}  ` : indentation;
+  return `${before}\n${indent}${comment}\n${indent}${entry}${after}`;
+}
diff --git a/.lvbt/web-platform/standards/web-platform.ts b/.lvbt/web-platform/standards/web-platform.ts
index 742c8b5..67bf12d 100644
--- a/.lvbt/web-platform/standards/web-platform.ts
+++ b/.lvbt/web-platform/standards/web-platform.ts
@@ -4,6 +4,7 @@ import { mkdir, readFile, readdir, rename, rm, stat, writeFile } from 'node:fs/p
 import path from 'node:path';
 
 import { syncAstroTypesBeforeLint } from './astro-sync.ts';
+import { syncConsumerIgnores } from './consumer-ignores.ts';
 
 export interface WebPreset {
   formatVersion: number;
@@ -150,7 +151,7 @@ export async function applyPreset(root: string, bundle: WebPreset, dryRun = fals
   const consumerChanged = [
     ...new Set([
       ...(await migrateLegacyPackageScope(root, dryRun)),
-      ...(await ignorePlaywrightOutput(root, dryRun)),
+      ...(await syncConsumerIgnores(root, dryRun)),
       ...(await syncAstroTypesBeforeLint(root, dryRun)),
     ]),
   ].sort();
@@ -158,29 +159,6 @@ export async function applyPreset(root: string, bundle: WebPreset, dryRun = fals
   return { ...plan, consumerChanged };
 }
 
-// Playwright writes these beside each app's configuration, such as apps/site/test-results/.
-// Every example's .gitignore carries the same rules. A slash inside a pattern anchors it to the
-// .gitignore's own directory, so the cache rule needs its leading **/ to reach every app.
-export const PLAYWRIGHT_OUTPUT_IGNORES = [
-  'test-results/',
-  'playwright-report/',
-  'blob-report/',
-  '**/playwright/.cache/',
-];
-
-/** Appends the rules a consumer's root .gitignore lacks, leaving its own lines untouched. */
-async function ignorePlaywrightOutput(root: string, dryRun: boolean): Promise<string[]> {
-  const file = path.join(root, '.gitignore');
-  const source = await readFile(file, 'utf8').catch(() => null);
-  if (source === null) return [];
-  const present = new Set(source.split(/\r?\n/).map((line) => line.trim()));
-  const missing = PLAYWRIGHT_OUTPUT_IGNORES.filter((rule) => !present.has(rule));
-  if (missing.length === 0) return [];
-  const separator = source === '' || source.endsWith('\n') ? '' : '\n';
-  if (!dryRun) await writeFile(file, `${source}${separator}${missing.join('\n')}\n`);
-  return ['.gitignore'];
-}
-
 const SKIPPED_DIRECTORIES = new Set([
   '.git',
   'node_modules',
@@ -206,8 +184,10 @@ async function consumerFiles(root: string, relative = ''): Promise<string[]> {
   for (const entry of await readdir(directory, { withFileTypes: true })) {
     if (entry.name === '.lvbt' && relative === '') continue;
     if (entry.isDirectory()) {
-      if (!SKIPPED_DIRECTORIES.has(entry.name))
-        files.push(...(await consumerFiles(root, path.join(relative, entry.name))));
+      const directory = path.join(relative, entry.name);
+      // A nested checkout, such as an agent worktree under .claude/worktrees/, is another branch's.
+      if (!SKIPPED_DIRECTORIES.has(entry.name) && !existsSync(path.join(root, directory, '.git')))
+        files.push(...(await consumerFiles(root, directory)));
       continue;
     }
     if (entry.isFile()) files.push(path.join(relative, entry.name));
diff --git a/.markdownlint-cli2.jsonc b/.markdownlint-cli2.jsonc
index 350e5df..d49cf21 100644
--- a/.markdownlint-cli2.jsonc
+++ b/.markdownlint-cli2.jsonc
@@ -13,6 +13,7 @@
     // Playwright output.
     "**/test-results",
     "**/playwright-report",
+    // Agent worktrees are other checkouts of this repository.
     ".claude/worktrees",
     "node_modules",
     "**/node_modules",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index ece4be5..059e2a5 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -646,8 +646,8 @@ packages:
     resolution: {integrity: sha512-7GO6HghkA5fYG9TYnNxi14/7K9f5occMlp3zXAuSxn7CKCxt9xbNWG7yF8hTCSUchlfWSe3uLmlPfigevRItzQ==}
     engines: {node: '>=12'}
 
-  electron-to-chromium@1.5.434:
-    resolution: {integrity: sha512-7EeFW9OLf1NN9NKQP9xdOE/XKqjxv7JDPP6AEAkHli11+Fae1OaLoNuAf13hQv1PPNtuES0pLQSPk2+fS3s8ww==}
+  electron-to-chromium@1.5.436:
+    resolution: {integrity: sha512-iG79/xCF3iThADicbgbES2+liFYmTvelo7jWcEfg6lQ+Adrh7zShrXSg2ZdEDLbKjJ298kGAKMnnzVWobp0L+g==}
 
   entities@4.5.0:
     resolution: {integrity: sha512-V0hjH4dGPh9Ao5p0MoRY6BVqtwCjhz6vI5LT8AJ55H+4g9/4vbHx1I54fS0XuclLhDHArPQCiMjDxjaL8fPxhw==}
@@ -1940,7 +1940,7 @@ snapshots:
     dependencies:
       baseline-browser-mapping: 2.11.25
       caniuse-lite: 1.0.30001810
-      electron-to-chromium: 1.5.434
+      electron-to-chromium: 1.5.436
       node-releases: 2.0.56
       update-browserslist-db: 1.3.3(browserslist@4.29.0)
 
@@ -1988,7 +1988,7 @@ snapshots:
 
   dotenv@16.0.3: {}
 
-  electron-to-chromium@1.5.434: {}
+  electron-to-chromium@1.5.436: {}
 
   entities@4.5.0: {}