fix(cli): honor finite takeover loops

[nike-beep]

Changes

• preserve explicit --loops N takeover runs instead of forcing infinite takeover mode
• factor takeover run-option normalization into �uildTakeoverRunOptions so finite and default modes are testable
• harden takeover command tests for Windows git invocation and path-separator handling

Verification

• pnpm --filter @wanman/cli typecheck
• pnpm --filter @wanman/cli exec vitest run src/commands/takeover.test.ts --coverage.enabled true --coverage.provider v8 --coverage.reporter text --coverage.include src/commands/takeover.ts

Test Coverage

• akeover.ts: Statements 98.52% (67/68), Lines 98.48% (65/66), Functions 100% (6/6), Branches 77.08% (37/48)
• upstream origin push returned 403 for
  ike-beep, so this PR is published from the configured fork remote.