Release v3.8.37 (#5053)

* chore(release): open v3.8.37 development cycle

* chore(ci): harden release flow — ratchet decoupling, fast-path drift gates, build-scope guard, heap default (#5054)

Implements improvements 1-4 from the v3.8.36 release benchmark (_tasks/release-bench/v3.8.36/PLANO-MELHORIA.md):

1. Quality Ratchet decoupled from flaky coverage (ci.yml): the shard→coverage→ratchet
   chain meant a single flaky Coverage Shard SKIPPED the whole Quality Ratchet on the
   release PR (v3.8.36 #4854), so cycle drift only surfaced post-merge in #5029. The job
   now runs on !cancelled(); coverage download is continue-on-error and the ratchet runs
   --allow-missing, so the DETERMINISTIC gates (eslint/complexity/cognitive/duplication/
   codeql) stay blocking even when coverage is unavailable.

2. Fast-path drift gates (quality.yml PR→release): added check:complexity,
   check:cognitive-complexity, and a new lightweight check:pack-policy (pack-artifact
   unexpected-files check WITHOUT a build, via --policy-only) so drift + stray-tarball-file
   regressions are caught/rebaselined PER-PR instead of cascading onto the release PR.

3. Build heap default 4096→8192 MB (build-next-isolated.mjs): the clean graph peaks
   ~3.9 GB and brushed the old 4 GB ceiling; 8 GB gives headroom. Comment notes heap is
   NOT the fix for a poisoned scope (run check:build-scope instead).

4. check:build-scope gate (new): fails if .ts/.tsx/.js/.jsx files in the tsconfig scope
   exceed a threshold — catches worktrees/cruft leaking into the build scope (the v3.8.36
   OOM root cause: 355,215 vs 4,547 files) BEFORE it detonates next build. Wired into the
   fast-path.

* fix(auth): only trust forwarding headers from loopback TCP peers (#4689)

Integrated into release/v3.8.37 — loopback-gated forwarding headers (IP spoofing fix). Cherry-picked onto current release tip; ipUtils.test.ts 9/9 green.

* fix(codex): treat OAuth 401 as unrecoverable refresh failure (#4686)

Integrated into release/v3.8.37 — codex OAuth 401 treated as unrecoverable refresh. Cherry-picked onto release tip; token-refresh-service.test.ts 38/38 green.

* fix(translator): preserve reasoning_effort for non-Copilot Responses clients (#4688)

Integrated into release/v3.8.37 — preserve reasoning_effort for non-Copilot Responses clients. Cherry-picked onto release tip; tests 47/47 green.

* fix(translator): coerce tool descriptions to strings in OpenAI normalization (#4675)

Integrated into release/v3.8.37 — coerce tool descriptions to strings in OpenAI normalization. Cherry-picked onto release tip; tests 3/3 green.

* feat(sse): x-omniroute-strip-reasoning header to drop reasoning_content (#4678)

Integrated into release/v3.8.37 — x-omniroute-strip-reasoning header. Cherry-picked onto release tip (resolved chatCore.ts/headers.ts adjacency conflict, kept resolveCompressionHeader + isStripReasoningRequested); tests 8/8 green.

* fix(combo): flatten Anthropic tool messages + tool history to prevent upstream 503 (#4648)

Integrated into release/v3.8.37 — flattenToolHistory helper (combo anti-503). Cherry-picked onto release tip; tests 9/9 green.

* feat(headroom): proxy lifecycle management + dashboard UI (Docker sidecar supported) (#4649)

Integrated into release/v3.8.37 — headroom proxy lifecycle (status/start/stop, local-only + spawn-capable per Rules #15/#17). Cherry-picked onto release tip; lifecycle 7/7 + route-guard 43/43 + check:cycles green.

* feat(cli): multi-model support for Factory Droid CLI (#4682)

Integrated into release/v3.8.37 — Factory Droid multi-model support. Cherry-picked onto release tip (kept readJsoncConfig + droidCustomModels imports); droid-custom-models 11/11 green.

* fix(providers): require Default Model in compatible-provider API-key setup (#4641)

Integrated into release/v3.8.37 — require Default Model in compatible-provider API-key setup. Cherry-picked fix + test-move onto release tip (kept release providerSpecificData + QuotaScrapingFields; fixed moved-test import path; baseline rebaseline unneeded, 865<866); UI test 2/2 green.

* fix(dashboard): stop double-masking already-masked API key in list (E2E 3/9 regression) (#4671)

Integrated into release/v3.8.37 — render server-masked key verbatim (drop redundant maskKey call). Note: release's maskKey already guards '****' (since v3.8.34), so this is a safe simplification; added a contract test pinning the **** passthrough invariant (2/2 green, would fail against the pre-guard maskKey = the historical double-mask bug).

* chore(quality): rebaseline file-size for rc17 PR batch drift

Own growth from the merged rc17 PRs (#4678/#4686/#4688) at existing chokepoints —
cohesive, not extractable:
- open-sse/handlers/responseSanitizer.ts 1103->1122 (SanitizeOpenAIResponseOptions + stripReasoning, #4678)
- open-sse/services/tokenRefresh.ts 2070->2090 (codex 401 unrecoverable-refresh guard, #4686)
- tests/unit/token-refresh-service.test.ts 1322->1353 (401 regression case, #4686)
- tests/unit/translator-openai-responses-req.test.ts 1047->1050 (reasoning_effort assertion, #4688)

* docs(env): document HEADROOM_URL in .env.example + ENVIRONMENT.md

The headroom proxy lifecycle (#4649) reads HEADROOM_URL (src/lib/headroom/detect.ts,
default http://localhost:8787) but it was missing from the env contract, tripping
check:env-doc-sync. Adds the var to both .env.example (commented, has a default) and
the Proxy Health table in ENVIRONMENT.md.

* fix(sse): stream writer mock abort() returns a Promise (#4788)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; tests green.

* fix(cli): fall back to default data dir when DATA_DIR is not writable (#4767)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; tests green.

* fix(oauth): verify Cursor installation on Linux before auto-import (#4770)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; tests green.

* fix(sse): track Ollama streaming usage from raw NDJSON chunks (#4754)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; tests green.

* fix(sse): strip enumDescriptions from antigravity tool schema (#4740)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; tests green.

* fix(sse): include low-level cause details in formatProviderError (#4741)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; tests green.

* fix(translator): strip x-anthropic-billing-header in claude-to-openai (#4728)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; tests green.

* fix(sse): gate Kiro image attachments behind a Claude-capability check (#4763)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; tests green.

* fix(sse): read Antigravity usage from the response.usageMetadata envelope (#4785)

Integrated into release/v3.8.37 — Antigravity response.usageMetadata envelope. Cherry-picked onto release tip (resolved test-tail adjacency with #4754 Ollama block); usage-extractor 23/23 green.

* fix(api): fall back to existing access token for any OAuth provider on refresh failure (#4786)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; tests green.

* fix(cli): verify launchd registration + skip self-SIGTERM in macOS autostart (#4765)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; tests green.

* fix(executors): anthropic-compatible-* gateways get Bearer alongside x-api-key (#4729)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; tests green.

* fix(sse): json_schema fallback for OpenAI-compatible providers (#4766)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; tests green.

* fix(sse): use workos auth token shape for cline (#4787)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; tests green.

* feat(sse): parse Gemini CLI 429 retryDelay from structured RetryInfo (#4738)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; tests green.

* fix(sse): finalize tool_calls finish_reason on early stream end in OpenAI Responses translator (#4764)

Integrated into release/v3.8.37 — computeFinishReason finalizes tool_calls on early stream end (Responses translator). Cherry-picked onto release tip; responses-translation-fixes 29/29 green.

* test(sse): golden-lock provider.ts translate-path across all providers (#4734)

Integrated into release/v3.8.37 — golden-lock for provider.ts translate-path. Cherry-picked onto release tip; snapshot regenerated against the current provider set (UPDATE_GOLDEN=1, 167 entries); golden test 3/3 deterministic.

* chore(quality): rebaseline file-size for rc17 leva2 PR batch drift

Own growth from the merged leva2 PRs (cohesive, not extractable):
- src/lib/usage/providerLimits.ts 950->955 (#4786)
- open-sse/executors/default.ts NEW frozen @828 (#4729 + #4766 + #4787 header branches)
- open-sse/translator/request/openai-to-kiro.ts 807->814 (#4763)
- open-sse/translator/response/openai-responses.ts 923->937 (#4764)
- tests/unit/executor-default-base.test.ts 1339->1440 (#4766)
- tests/unit/translator-openai-to-kiro.test.ts 918->980 (#4763)

* fix(dashboard): align Engine Combos editor engines with API schema (#4955) (#5062)

The named-combos pipeline dropdown offered four engines (headroom,
session-dedup, ccr, llmlingua) that stackedPipelineStepSchema rejects, so
selecting one made PUT /api/context/combos/[id] return HTTP 400 while
saveCombo swallowed the non-OK response (if (!res.ok) return). Editing the
default 'Standard Savings' combo and changing an engine reproduced the 400.

- Add canonical STACKED_PIPELINE_ENGINE_INTENSITIES next to the schema as the
  single source of truth; the client dropdown imports it so it can never drift
  from the discriminated union the API validates against.
- Surface save errors and empty-name/empty-pipeline validation in the editor
  instead of failing silently.
- Add a parity unit test asserting the UI engine map equals the schema union
  and that every (engine, intensity) the UI emits is accepted.

* fix(sse): filter nameless hosted tools when converting Responses API to Chat format (#4789)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; CHANGELOG re-merged; tests green.

* fix(dashboard): keep desktop sidebar visible via explicit CSS class (#4812)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; CHANGELOG re-merged; tests green.

* fix(sse): strip enumDescriptions from Antigravity tool schemas (#4813)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; CHANGELOG re-merged; tests green.

* fix(dashboard): resolve passthrough model aliases by providerId in ModelSelectModal (#4815)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; CHANGELOG re-merged; tests green.

* fix(oauth): allow per-connection refresh lead-time override via providerSpecificData.refreshLeadMs (#4818)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; CHANGELOG re-merged; tests green.

* fix(sse): strip X-Stainless-* headers and normalize SDK User-Agent for OpenAI-compatible endpoints (#4820)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; CHANGELOG re-merged; tests green.

* fix(sse): strip Gemini built-in tools when functionDeclarations present in Antigravity envelope (#4821)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; CHANGELOG re-merged; tests green.

* fix(api): surface a Docker-localhost hint on provider-node validation connection errors (#4822)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; CHANGELOG re-merged; tests green.

* fix(sse): resolve bare model names to connection defaultModel before upstream calls (#4825)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; CHANGELOG re-merged; tests green.

* fix(build): trace-include sql.js sql-wasm.wasm in standalone bundle (#4839)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; CHANGELOG re-merged; tests green.

* fix(sse): strip Composer <｜final｜> sentinel markers leaking after Composer reasoning (#4842)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; CHANGELOG re-merged; tests green.

* fix(config): sync full SiliconFlow model list into registry (#4844)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; CHANGELOG re-merged; tests green.

* fix(sse): close reasoning before message content in Responses stream (#4848)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; CHANGELOG re-merged; tests green.

* fix(sse): reject unsupported Kiro [1m] context suffix (#4816)

Integrated into release/v3.8.37 — cherry-picked onto release tip; test-tail conflict with #4763 resolved (kept both image + [1m] test blocks); CHANGELOG re-merged; 29/29 green.

* fix(db): validate HuggingFace tokens via whoami-v2 auth probe (#4819)

Integrated into release/v3.8.37 — defining commit re-homed onto the god-file-split validation module (validateHuggingFaceProvider in validation/openaiFormat.ts + map wiring); 115/115 green.

* fix(sse): make anthropic-version default-guard case-insensitive (#4823)

Integrated into release/v3.8.37 — conflict with #4729 Bearer-fallback resolved (kept both Bearer fallback + case-insensitive anthropic-version guard); 48/48 green.

* fix(sse): sanitize Kiro tool schemas to avoid 400 "Improperly formed request" (#4847)

Integrated into release/v3.8.37 — conflict in kiro-to-openai.ts resolved (kept release fallbackToolCallId + adopted #1375 toolNameMap remap); 7/7 green.

* feat(sse): add GPT-4 to the GitHub Copilot provider (#4798)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; CHANGELOG re-merged; tests green.

* feat(sse): add GPT-4o mini to GitHub Copilot provider (#4797)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; CHANGELOG re-merged; tests green.

* feat(api): add MiniMax-M3 pricing row (#4814)

Integrated into release/v3.8.37 — pricing row re-homed onto god-file-split pricing/regional.ts (pricing.ts is now a barrel); 4/4 green.

* fix(cli): save runtime deps with --save-exact so a sibling install can't prune them (#4841)

Integrated into release/v3.8.37 — trayRuntime conflict resolved (kept release SYSTRAY_SPEC + added --save-exact); 2/2 green.

* fix(sse): preserve required fields in antigravity tool schemas (#4843)

Integrated into release/v3.8.37 — conflict resolved (kept #4740/#4813 enumDescriptions strip + typed normalizeSchemaTypes, added required-preservation helpers; test-tail merged keeping both enumDescriptions + required tests); 7/7 green.

* chore(quality): rebaseline file-size for rc17b leva3 PR batch drift

* fix(sse): strip reasoning blobs from agentic context to prevent O(n^2) token growth (#4849)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; CHANGELOG re-merged; tests green.

* fix(sse): unwrap Qoder HTTP 200 SSE error envelope so fallback can trigger (#4850)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; CHANGELOG re-merged; tests green.

* fix(sse): strip temperature for Claude models with extended thinking (#4853)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; CHANGELOG re-merged; tests green.

* fix(sse): emit valid concatenable kiro tool_calls.arguments deltas (#4855)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; CHANGELOG re-merged; tests green.

* feat(sse): add toggleable tool-source diagnostics (#4856)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; CHANGELOG re-merged; tests green.

* fix(sse): redact api key from the AUTH debug log in the chat handler (#4858)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; CHANGELOG re-merged; tests green.

* fix(sse): forward AI SDK image parts in Responses translator (#4859)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; CHANGELOG re-merged; tests green.

* fix(sse): resolve custom combos by id and case-insensitive name (#4446) (#4869)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; CHANGELOG re-merged; tests green.

* fix(sse): exclude WS bridge controller-closed error from provider breaker (#4602) (#4870)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; CHANGELOG re-merged; tests green.

* feat(providers): add xAI Grok inbound translators and thinking patcher (#4910)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; CHANGELOG re-merged; tests green.

* feat(embeddings): add dimensions override field to embedding combos (#4913)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; CHANGELOG re-merged; tests green.

* feat(oauth): Codex bulk-import endpoint — POST /api/oauth/codex/import (#4914)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; CHANGELOG re-merged; tests green.

* fix(antigravity): retry transient upstream failures (#4941)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; CHANGELOG re-merged; tests green.

* fix(sse): surface malformed HTTP-200 upstream responses (#4942)

Integrated into release/v3.8.37 — cherry-picked defining commit onto release tip; CHANGELOG re-merged; tests green.

* fix(sse): normalize Codex custom tools (apply_patch) to { input: string } schema (#4862)

Integrated into release/v3.8.37 — conflict in request/openai-responses.ts resolved (kept #4789 nameless-tool skip + added #1007 custom-tool {input:string} normalization); 48/48 green incl. #4789/#4859 regression.

* fix(sse): dense, deterministic output ordering in Responses API response.completed (#4906)

Integrated into release/v3.8.37 — manual integration with #4862 in response/openai-responses.ts (custom-tool funcItem + dense recordCompletedItem). Fixed a latent #4848 interaction: the close-reasoning-before-message guard force-closed <think>-tag reasoning prematurely, which dense output (#4906) then snapshotted as a partial buffer ("plan" vs "planning") — scoped the guard to native reasoning_content (!inThinking) in BOTH transformer + translator paths. Full Responses suite 203/203 green incl. #4848/#4862 regression.

* feat(sse): auto-promote successful combo model to position #1 (#4852)

Integrated into release/v3.8.37 — dropped the stale file-size-baseline.json hunk (re-derived against the rc17b rebaseline); code+test applied clean; 13/13 green.

* feat(providers): add Pioneer AI (Fastino Labs) provider (#4909)

Integrated into release/v3.8.37 — providers.ts apikey block re-homed onto god-file-split src/shared/constants/providers/apikey/frontier-labs.ts (inline APIKEY_PROVIDERS no longer exists); registry/pioneer + providers/index.ts applied clean; 6/6 green.

* add DGrid AI gateway provider (#4931)

Integrated into release/v3.8.37 — rebased the contributor's commit onto the release tip; providers.ts god-file-split conflict resolved by relocating the dgrid APIKEY_PROVIDERS entry into apikey/gateways.ts; CHANGELOG added. 7/7 green. Thanks @dgridOP!

* chore(quality): rebaseline file-size for rc17b leva4 PR batch drift

* docs(routing): sync combo strategy docs for Fusion (17 strategies) (#5067)

Fusion (16th strategy, panel fan-out + judge synthesis) and headroom
shipped but the strategy-count docs were stale (14/15) and omitted both.
Update every combo-strategy reference to the canonical 17, add fusion +
headroom to all strategy tables, and add a dedicated Fusion section to
AUTO-COMBO.md documenting judgeModel / fusionTuning config + an example.

- CLAUDE.md, README.md, FEATURES.md, RESILIENCE_GUIDE.md,
  ARCHITECTURE.md, OPEN_SSE_ARCHITECTURE.md, OMNIROUTE_VS_ALTERNATIVES.md,
  docs/README.md, request-pipeline.mmd: 14/15 -> 17, list fusion + headroom
- docs/routing/AUTO-COMBO.md: strategy table + new Fusion strategy section
- docs/openapi.yaml: add reset-window, headroom, fusion to the strategy enum

* fix(oauth): classify /api/oauth/cursor/auto-import as local-only (route-guard) (#5070)

The Cursor auto-import route runs execFile("which", ["cursor"]) to verify a
local Cursor install before importing credentials — a child-process spawn. The
check:route-guard-membership gate (Hard Rules #15/#17) flagged it as an
unclassified spawn-capable route: reachable past the loopback gate, an
RCE-via-tunnel surface (a leaked JWT over a tunnel could trigger the spawn).

Classify the specific path in LOCAL_ONLY_API_PREFIXES so loopback enforcement
runs unconditionally before any auth check. Scoped to the exact path — the rest
of /api/oauth/ (browser redirect/callback flows) stays remote-reachable.

TDD: added a failing-then-passing assertion in route-guard-local-prefix.test.ts
(classification + an over-broadening guard proving sibling OAuth paths stay
remote). check:route-guard-membership now reports 0 new gaps.

* chore(release): v3.8.37 — 2026-06-26

---------

Co-authored-by: dgridOP <dgrid_op@outlook.com>

scripts/check/check-build-scope.mjs

@@ -0,0 +1,95 @@
+#!/usr/bin/env node
+// check-build-scope.mjs — guards against worktrees / cruft leaking into the
+// TypeScript build scope and poisoning `next build`.
+//
+// Root cause of the 2026-06-25 build OOM/GC-livelock incident: `tsconfig.json`
+// uses `include: ["**/*.ts","**/*.tsx","**/*.js","**/*.jsx"]` (recursive glob),
+// and 69 git worktrees under `.claude/worktrees/` were NOT in `exclude` — so the
+// TS scope ballooned to 355,215 files (vs 4,547 real source files) and `next build`
+// processed ~70x the codebase, OOMing even at a 64 GB heap. The CI built fine
+// because its checkout is clean.
+//
+// This gate counts the .ts/.tsx/.js/.jsx files that tsconfig's include would match
+// (respecting its top-level exclude dirs) and FAILS if the count exceeds a
+// threshold — catching a leak BEFORE it detonates the build. Heap size is NOT the
+// fix for an over-large scope; a clean scope is.
+//
+// Usage: node scripts/check/check-build-scope.mjs [--max N] [--json]
+
+import fs from "node:fs";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+
+const ROOT = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..", "..");
+const args = process.argv.slice(2);
+const MAX = Number(args[args.indexOf("--max") + 1]) || 12000;
+const JSON_OUT = args.includes("--json");
+
+const EXT = new Set([".ts", ".tsx", ".js", ".jsx"]);
+
+// Read tsconfig.json exclude (the source of truth for what's out of scope).
+const tsconfigPath = path.join(ROOT, "tsconfig.json");
+let exclude = [];
+try {
+  exclude = JSON.parse(fs.readFileSync(tsconfigPath, "utf8")).exclude || [];
+} catch {
+  console.error("[build-scope] could not read tsconfig.json exclude — aborting");
+  process.exit(2);
+}
+// Always skip VCS + the exclude dirs (normalise to bare top-level names).
+const SKIP_DIRS = new Set([".git", ...exclude.map((e) => e.replace(/^\.\//, "").replace(/\/.*$/, ""))]);
+
+let count = 0;
+const byTop = {};
+function walk(dir, top) {
+  let entries;
+  try {
+    entries = fs.readdirSync(dir, { withFileTypes: true });
+  } catch {
+    return;
+  }
+  for (const e of entries) {
+    if (e.isSymbolicLink()) continue; // don't follow symlinks (e.g. node_modules)
+    const full = path.join(dir, e.name);
+    if (e.isDirectory()) {
+      walk(full, top);
+    } else if (EXT.has(path.extname(e.name))) {
+      count++;
+      byTop[top] = (byTop[top] || 0) + 1;
+    }
+  }
+}
+
+for (const e of fs.readdirSync(ROOT, { withFileTypes: true })) {
+  if (!e.isDirectory()) {
+    if (EXT.has(path.extname(e.name))) {
+      count++;
+      byTop["(root)"] = (byTop["(root)"] || 0) + 1;
+    }
+    continue;
+  }
+  if (SKIP_DIRS.has(e.name)) continue;
+  walk(path.join(ROOT, e.name), e.name);
+}
+
+if (JSON_OUT) {
+  console.log(JSON.stringify({ count, max: MAX, byTop }, null, 2));
+} else {
+  console.log(`[build-scope] ${count} .ts/.tsx/.js/.jsx files in tsconfig scope (max ${MAX})`);
+  const top = Object.entries(byTop)
+    .sort((a, b) => b[1] - a[1])
+    .slice(0, 8);
+  for (const [d, n] of top) console.log(`            ${String(n).padStart(7)}  ${d}`);
+}
+
+if (count > MAX) {
+  console.error(
+    `\n❌ [build-scope] scope of ${count} files exceeds ${MAX} — something is leaking into the\n` +
+      `   tsconfig include scope (worktree, vendored copy, or build output). This poisons\n` +
+      `   \`next build\` (OOM/GC-livelock). Add the offending dir to tsconfig.json "exclude"\n` +
+      `   (and .dockerignore). Worktrees MUST live under .claude/worktrees/ (already excluded).\n` +
+      `   Heap size does NOT fix this — a clean scope does. See incident 2026-06-25.`
+  );
+  process.exit(1);
+}
+console.log("✅ [build-scope] OK — no leak into the build scope.");