feat(status-pages): add third-party outage signals from updog.ai

[platinummonkey]

Summary

Adds pup status-pages third-party subcommand that fetches third-party service outage signals from updog.ai, giving users visibility into external service health (AWS, GCP, Stripe, etc.) that may affect their Datadog integrations.

Changes

• New cmd/status_pages_third_party.go — command, types, filtering, sparkline chart, custom table rendering
• New cmd/status_pages_third_party_test.go — 23 tests covering sparkline, table, search, errors
• Updated cmd/status_pages_test.go — subcommand registration test includes third-party

Usage

# List all third-party outage signals (JSON)
pup status-pages third-party

# Table view with 30-day colored sparkline chart
pup status-pages third-party --output=table

# Search by provider name or display name
pup status-pages third-party --search=amazon --output=table

# Show only providers with active outages
pup status-pages third-party --active --output=table

Table output

┌──────────┬────────────────────────┬─────────┬────────────────────────────────┬─────────────┐
│ PROVIDER │ DISPLAY NAME           │ SERVICE │ UPTIME                         │ STATUS      │
├──────────┼────────────────────────┼─────────┼────────────────────────────────┼─────────────┤
│ aws-s3   │ Amazon S3              │ S3      │ ████████████████████████████░█ │ active      │
│ stripe   │ Stripe                 │         │ ██████████████████████████████ │ operational │
│ gcp      │ Google Cloud Platform  │         │ ██████████████████████████████ │ operational │
└──────────┴────────────────────────┴─────────┴────────────────────────────────┴─────────────┘

Each character in the UPTIME column = 1 day over the last 30 days:

• Green █ — operational
• Red █ — outage detected
• Dim · — before monitoring started

Design Notes

• No Datadog authentication required — public updog.ai API
• --search matches both provider_name and display_name (case-insensitive)
• buildSparkline() uses ANSI green/red/dim for terminal color output
• timeNow var is injectable for deterministic test assertions
• JSON/YAML output returns full provider data with outage history

Test plan

• 23 tests pass — sparkline (5 cases), status (4), filter (8), table (2), e2e runs (7 incl. search-by-display-name)
• Existing status-pages tests updated and passing
• Full test suite passes with -race detection
• go build ./... succeeds

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