feat: Add bounded full-catalog import timeout contract

[StatPan]

Closes #163

[StatPan]

Check

Self-review packet for ticket #163 and PR #164.

• PR readiness: blocked
• Finish ready: false
• Blockers: checks_pending
• Diff summary: 3 files changed, +69/-20
  • internal/cli/cli.go: +32/-20
  • internal/cli/cli_test.go: +36/-0
  • internal/datago/importer.go: +1/-0
• Acceptance mapping candidates:
  • A caller can set a positive full-import deadline explicitly. -> internal/datago/importer.go
  • The deadline applies to the complete import and returns redacted request-failure evidence on expiry. -> internal/datago/importer.go
  • Existing default invocation behavior remains unchanged. -> manual verification required
  • Focused Go tests pass. -> manual verification required
• Risk areas: Go runtime code changed
• Full diff: gh pr diff 164 --repo StatPan/datapan-cli

Reviewer notes:

• Findings: none recorded by this self-review command.
• Test gaps: verify local and CI evidence before finish.
• Recommended action: continue normal review/check/finish flow.

Context:

• Ticket: Add bounded full-catalog import timeout contract #163
• Status: In review
• Linked PR: feat: Add bounded full-catalog import timeout contract #164
• Blockers: checks_pending
• Next: wait for required checks to finish or fix failing checks