fix: stabilize Windows MCP packaging and logger tests

[Sun-sunshine06]

Summary

• stage bundled MCP outputs into .bundle-resources/mcp before packaging so electron-builder no longer copies directly from freshly-written dist-mcp files on Windows
• add retry-based MCP staging helpers and a regression test covering the staged resource path
• make logger context tests wait for log files to appear and stabilize before reading to reduce file I/O flakes

Validation

• npm.cmd run typecheck
• npm.cmd test -- --run tests/logger-context.test.ts tests/bundle-mcp-script.test.ts tests/build-windows-script.test.ts tests/windows-legacy-uninstall-remediation.test.ts
• npm.cmd run build:win

[hqhq1025]

⚠️ Request Changes — Critical merge conflict with current main

The MCP staging approach is sound and correctly solves the Windows EBUSY issue.

🚨 Blocking: decryptWithFallback authTag parameter

This PR modifies credentials-store.ts's decryptWithFallback signature, but it appears to be based on an older version of the file. The current main branch has authTag?: string as a third parameter (line ~212). If this PR merges as-is, the authTag parameter would be silently dropped, causing all GCM-encrypted credentials to fail decryption (ERR_CRYPTO_INVALID_TAG).

Action needed: Rebase onto current main and reconcile the decryptWithFallback signature.

Other findings

• Medium: replaceDirectoryWithRetries silently returns on ambiguous rename failure (source disappears mid-operation). Consider asserting the destination contains expected files before returning.
• Low: Dead code in removePathWithRetries and copyFileWithRetries — unreachable lastError throw after the loop
• Medium: Logger test stabilization replaces stream finish event with polling, which is less reliable
• Low: Variable shadowing logFilePath in the new getLogContent

[hqhq1025]

Hi @Sun-sunshine06, thanks for tackling the Windows EBUSY packaging issue!

I've cherry-picked the MCP staging mechanism from this PR into main (commit 39b825c):

Adopted:

• scripts/bundle-mcp.js: Full staging pipeline with retry helpers
• electron-builder.yml: dist-mcp → .bundle-resources/mcp across all platforms
• .gitignore / package.json: Supporting changes
• tests/bundle-mcp-script.test.ts: Staging regression tests

Fixes applied on top:

• Removed unreachable throw lastError dead code after retry loops
• Added destination directory verification in replaceDirectoryWithRetries

Not adopted (with reasons):

• credentials-store.ts — Based on an older version of the file. Current main has authTag as a third parameter for GCM decryption. Merging would silently drop it, breaking all GCM-encrypted credential decryption.
• credentials-store-legacy-key.test.ts — Depends on looksSuspiciousDecryptedText() which doesn't exist in current main
• logger-context.test.ts — Polling approach is less reliable than the current stream finish event method

Your authorship is preserved via --author on the commit. I'm going to close this PR since the relevant changes are now on main. Thanks for the contribution! 🙏