refactor: migrate test runner from bun:test to vitest (WIP)

[BYK]

Summary

Phase 3 of the Bun to Node.js migration. Migrates 327 test files from bun:test to vitest.

Results

• 306/307 test files pass (1 skipped: Bun-specific concurrent DB test)
• 6994/7014 tests pass (20 skipped: Bun-specific behavior tests)
• 0 failures

Changes

Infrastructure:

• Added vitest as devDependency
• Created vitest.config.ts with setupFiles, forks pool, custom Vite plugins
• Custom matchers: toStartWith, toEndWith, toBeString, toBeArray
• Vite plugins: text import (with { type: "text" }), require .js-to-.ts, resolve .js-to-.ts
• Updated package.json test scripts to use vitest
• Removed bun:sqlite fallback from sqlite.ts

Test file migration (327 files):

• from "bun:test" to from "vitest"
• mock to vi, spyOn to vi.spyOn, mock.module to vi.mock
• vi.hoisted() for 12 files with mock factory hoisting
• vi.mock() with importOriginal for 46 files with namespace spy patterns
• Converted barrel re-export spies to internal module mocks for ESM compatibility

Bun API replacements in tests (40+ files):

• Bun.spawn/spawnSync to node:child_process
• Bun.file/write/sleep/gzip to Node.js equivalents
• Bun.serve mock server to node:http createServer
• import.meta.dir to import.meta.dirname
• BUN_TEST_WORKER_ID to VITEST_POOL_ID

Source changes (minimal):

• src/lib/list-command.ts: try-catch around require("../app.js") for vitest compat
• src/lib/telemetry.ts: top-level import replacing lazy require

[github-actions]

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[github-actions]

Codecov Results 📊

✅ Patch coverage is 82.36%. Project has 4055 uncovered lines.
✅ Project coverage is 82.36%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    76.61%    82.36%    +5.75%
==========================================
  Files          324       324         —
  Lines        63171     22986    -40185
  Branches         0     14880    +14880
==========================================
+ Hits         48396     18931    -29465
- Misses       14775      4055    -10720
- Partials         0      1608     +1608

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Generated by Codecov Action

[BYK]

Recreating PR with a fresh branch to trigger CI (GitHub stopped triggering ci.yml on the old branch after many force pushes).