feat(vscode): promote timed out commands to background jobs

[zhanba]

Summary

• run supported foreground commands through a single interactive PTY and adopt that same process into a background terminal on timeout
• preserve replayed/live output, lifecycle cleanup, terminal input and resize handling, and background job metadata across the VS Code WebUI bridge
• retain shell-integration fallbacks for unsupported hosts and add lifecycle, promotion, UI, and packaged node-pty coverage

Test plan

• bun check
• TypeScript checks for packages/vscode, packages/common, and packages/vscode-webui
• VS Code Mocha suite: 226 passing
• WebUI suite: 520 passing
• Tools suite: 118 passing
• bun turbo test:integration (three attempts failed before E2E execution while downloading VS Code 1.108.0 with TLS ECONNRESET)

Notes

• The existing unrelated bun.lock modification is intentionally excluded from this PR.

🤖 Generated with Pochi | Task

[codecov-commenter]

Codecov Report

❌ Patch coverage is 81.65503% with 184 lines in your changes missing coverage. Please review.
✅ Project coverage is 33.65%. Comparing base (ab3dc4d) to head (8e18611).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...s/vscode/src/integrations/terminal/terminal-job.ts	71.95%	99 Missing ⚠️
...es/vscode/src/integrations/terminal/pty-process.ts	81.49%	42 Missing ⚠️
packages/cli/src/tools/execute-command.ts	90.27%	14 Missing ⚠️
packages/cli/src/lib/background-job-manager.ts	91.78%	6 Missing ⚠️
.../integrations/terminal/execute-command-with-pty.ts	91.78%	6 Missing ⚠️
packages/tools/src/execute-command.ts	0.00%	3 Missing ⚠️
...rc/features/chat/lib/batched-tool-call-adapters.ts	0.00%	3 Missing ⚠️
...ebui/src/features/chat/lib/tool-call-life-cycle.ts	0.00%	3 Missing ⚠️
...scode-webui/src/lib/vscode-running-task-adaptor.ts	0.00%	3 Missing ⚠️
packages/vscode/src/tools/execute-command.ts	92.30%	3 Missing ⚠️
... and 2 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1930      +/-   ##
==========================================
+ Coverage   33.32%   33.65%   +0.33%     
==========================================
  Files         778      780       +2     
  Lines       83120    83628     +508     
  Branches     4897     4861      -36     
==========================================
+ Hits        27696    28144     +448     
- Misses      55304    55364      +60     
  Partials      120      120              

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