fix(cli): archive passes -y and configurable timeout

[aiyinluya]

Root cause

• \openspec archive\ without -y\ waits for stdin confirmation. In the extension webview there is no TTY, so the CLI hangs until the built-in timeout kills the process (\Command timed out after 30 seconds).
• When main specs are already merged manually, full archive can fail on spec merge conflicts; the OpenSpec CLI supports --skip-specs\ for that case.

Changes

• **\�rchiveChange**: invoke \openspec archive -y; if \openspec.archiveSkipSpecs\ is \ rue, append --skip-specs.
• **\execOpenSpecOnce**: CLI timeout is read from \openspec.cliTimeoutMs\ (default 120000); error message includes the configured milliseconds.
• **\package.json**: contribute \openspec.cliTimeoutMs\ (5000–600000, default 120000) and \openspec.archiveSkipSpecs\ (boolean, default false).
• Tests: mock \�scode.workspace.getConfiguration; expect -y\ on archive; align timeout tests with 120s default and error text.

Verification

\\�ash
npx vitest run test/extension/services/openspecCli.test.ts
\\

All 24 tests passed locally.

Made with Cursor

[RandyZ]

test case resolve conflict