[WIP] Fix all CI build and test errors

[Copilot]

• Investigate CI build and test failures
• Identify root cause: pnpm-lock.yaml is out of date with apps/studio/package.json (missing @objectstack/service-ai@workspace:*)
• Identify secondary issue: @objectstack/service-ai#test failures in earlier CI run
• Fix: Regenerate pnpm-lock.yaml by running pnpm install (blocked - pnpm not available in sandbox)
• Fix: Investigate and fix service-ai test failures
• Verify all CI workflows pass

Root Cause Analysis

Primary blocker (affects ALL CI workflows on main):
apps/studio/package.json has @objectstack/service-ai@workspace:* as a dependency, but pnpm-lock.yaml was never updated to include this entry in the apps/studio section (line 128-230). This causes ERR_PNPM_OUTDATED_LOCKFILE on every CI run with --frozen-lockfile.

Fix: Run pnpm install locally to regenerate the lockfile, then commit the updated pnpm-lock.yaml.

Secondary issue (pre-existing):
@objectstack/service-ai#test was failing in CI run 23842893933 (prior to the lockfile issue). The turbo output interleaving prevented extracting the specific test failure details from CI logs.

Original prompt

fix all ci build and test errors

[vercel]

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Project	Deployment	Actions	Updated (UTC)
objectstack-play	Building	Preview, Comment	Apr 1, 2026 0:49am
spec	Building	Preview, Comment	Apr 1, 2026 0:49am

[hotlong]

@copilot 继续

[Copilot]

@copilot 继续

Fixed both CI issues:

1. pnpm-lock.yaml out of date — Regenerated lockfile to include @objectstack/service-ai@workspace:* for apps/studio (commit 8864d6c).

2. vercel-stream-encoder test failures — Tests were expecting old v5 Vercel Data Stream Protocol format (0:"text"\n) but the encoder was upgraded to v6 SSE UI Message Stream Protocol (data: {"type":"text-delta",...}\n\n). Updated all tests to match the current implementation (commit 67a6b2a).

Full build (43/43 tasks) and all tests pass locally.