test: run frontend verification natively under Bun

Make Bun the explicit Vitest runtime. Detect cyclic tool input before slow native pretty serialization, preserve shared references, and use native abort signals in the live jsdom probe. 2587 tests repeatedly green and2 real HTTP/UI tests pass; Bun-run typecheck, lint and production build pass without NODE_OPTIONS.

1 files changed, 59 insertions, 1 deletions

diff --git a/notes/text-file-embeds-implementation.md b/notes/text-file-embeds-implementation.md
index 349f67e..2f23a41 100644
--- a/notes/text-file-embeds-implementation.md
+++ b/notes/text-file-embeds-implementation.md
@@ -175,7 +175,7 @@ their existing **AS-IS bypass** contract; they do not receive appended guidance.
 The initial instructions in already-running/persisted conversations are not
 retroactively changed, and this task did not redeploy/restart the shared service.
 
-## Verification
+## Initial verification (superseded by Bun-native follow-up below)
 
 `bun install` completed inside both feature worktrees before build/testing; frontend
 was refreshed after backend declarations were built. All work is on
@@ -234,3 +234,61 @@ commits, visually confirm block styling/responsiveness on desktop/mobile, expand
 and collapse a longer Markdown plan, and click a remote-image consent button.
 No screenshots, graphical-browser layout check, AI-provider-generated live reply,
 remote file support, watchers, snapshots or editor/attachment redesign are claimed.
+
+## Bun-native verification follow-up — 2026-10-24
+
+This is the **authoritative final verification**, superseding the initial
+Node-backed Vitest results above. `bun run` previously respected Vitest's
+`#!/usr/bin/env node` launcher. Both repositories now explicitly execute
+`bun --bun node_modules/vitest/vitest.mjs` in `test` and `test:watch`, so ordinary
+`bun run test` uses Bun itself, including its workers. No `NODE_OPTIONS` is needed;
+all following runs explicitly unset it. Runtime: **Bun 1.4.3**.
+
+Bun-native runs exposed existing test assumptions which have been corrected, not
+skipped and not hidden with larger timeouts:
+
+- HTTP/WS listener tests now spy on **Bun.serve only** and restore it afterward,
+  instead of redefining the non-configurable global `Bun` object. The fallback
+  global stub remains only for non-Bun supplemental runners.
+- The image migration test sorts a directory listing before comparing its
+  contents; native filesystem enumeration order is not a contract.
+- The local-image home-expansion test uses a path relative to the actual OS home
+  into its temporary fixture; it no longer assumes mutating HOME changes Bun's
+  cached homedir result. No real home-directory file is created.
+- The frontend cyclic tool-input fallback was genuinely slow under Bun's pretty
+  JSON serializer. A local ancestor-stack replacer detects cycles before native
+  recursion, preserving the existing fallback text. Added a regression case for
+  nested cycles and **shared non-cyclic references** so valid JSON isn't rejected.
+  The original timeout-prone test now completes promptly; no timeout was raised.
+- The opt-in live UI/network test no longer depends on Node-only
+  `transferableAbortController`. Its scoped jsdom environment retains the
+  runtime's matching native AbortController/AbortSignal pair, so actual Bun fetch
+  and cancellation are exercised. The production adapter remains unchanged.
+
+Final commands/results:
+
+| Worktree | Command | Result |
+| --- | --- | --- |
+| frontend | `bun run test` | **2587 passed / 2 opt-in skipped**, repeated green (130 passed files / one skipped) |
+| frontend | `bun run test:text-file-live` | **2 passed**, real Svelte + ephemeral Bun HTTP + temp disk files |
+| frontend | `bun --bun run typecheck` | **0 errors / 0 warnings** |
+| frontend | `bun --bun run check` | **309 files clean**, no warnings/infos |
+| frontend | `bun --bun run build` | **passed**, existing initial-value/large-chunk advisories remain |
+| backend | `bun run test` | **4278 passed / 9 skipped**, twice (221 passed files / one skipped) |
+| backend | `bun run test:bun` | **190 passed / 0 failed** |
+| backend | `bun --bun run typecheck` | **passed** |
+| backend | `bun --bun run check` | **754 files clean**, no warnings/infos |
+| backend | `bun build ... --compile` (server and CLI) | **both passed**, ignored worktree-local binaries |
+
+The nine backend skips are the existing SSH integration suite; an additional
+Bun-only test previously skipped under Node now runs, hence 4278 rather than
+4277 passing. The frontend count increases by one for the new shared-reference
+regression test. The two frontend live tests are intentionally opt-in but were
+run separately and passed. No tests were excluded to obtain green results.
+
+Dependencies were refreshed using `bun install` inside both feature worktrees.
+The external-Claude standard-build wrapper limitation described above remains;
+no external/main checkout edits, installs, service restarts, merge or push were
+performed in this verification follow-up. No subagents were used. Native probe
+processes and temporary fixture files were cleaned up. Browser visual validation
+remains manual as documented above.