feat(agents): expand AR CLI surface

[VaibhavAcharya]

Summary

Expands netlify agents to use the full agent_runners API surface. Adds 7 new commands, extends create/list/show/stop with new flags, centralizes the API calls into a typed api.ts module, and replaces the static model whitelist with a live fetch from /api/v1/ai-gateway/providers.

New commands: follow-up, open, diff, pr, commit, publish, revert, archive, redeploy. New flags on existing commands: --watch, --session, --mode, --from-deploy, --parent, --dev-server-image, --attach, --branch/--user/--title/--since/--until/--page/--per-page/--account, --ndjson, --yes. Smarter defaults (local git branch detection, dirty/unpushed warnings) and renderer upgrades (hierarchical sessions, token + credit usage, conditional action hints, append-only watch ticker).

Test plan

• npm run lint, npm run typecheck, npx prettier --check src/commands/agents/ — all clean
• All 14 commands exercised end-to-end against the live API on a test site
• Real diffs, file attachments (S3 upload), follow-up sessions, redeploy, archive, revert, publish all verified
• Error paths verified for fake model IDs, invalid dates, missing files, no-repo PR/commit attempts
• No new tests added in this PR — existing integration tests rely on stubbed responses; new tests deserve a follow-up

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/agents-cli-revamp

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[github-actions]

📊 Benchmark results

Comparing with 07fa4d1

• Dependency count: 1,061 (no change)
• Package size: 357 MB (no change)
• Number of ts-expect-error directives: 355 (no change)