docs: document intent for supported checks and monitors

[checkly-rca-bot-angie]

Summary

The live Playwright construct reference and current construct docs omit intent. Add a shared reference and property-table entries for all nine CLI-supported types: API, Browser, Multistep, Playwright, URL, TCP, DNS, ICMP, and gRPC.

Document the goal/typed constraints shape, limits, whitespace trimming, and the distinction from descriptions, executable assertions, and automatic repair enablement. Keep the generic monitor table unchanged so SSL, heartbeat, and traceroute do not advertise unsupported options.

Intended CLI behavior

Per Stefan’s review, removing intent from code should clear the intent stored on the check. The CLI behavior will be fixed separately. This docs PR deliberately does not document the current preserve-on-omission behavior or the null clearing workaround, and does not claim the CLI fix has shipped.

Source verification

Verified against checkly/checkly-cli revision 32feaaadf0734a2e6d298fea1fa3b9f65cacefd0:

• Intent types and contract
• Validation
• Synthesis and runtime inheritance
• Checked individual monitor props for CheckIntentProps and runtime-check inheritance for all four check types. Playwright omits only retryStrategy.
• Existing intent tests

Validation

• git diff --check passed.
• API navigation tests: 6 passed.
• Legacy redirect destination check: 179 passed.
• API group badge/schema consistency passed.
• Executed the documented intent example through a local harness using the current CLI source validation methods (not stale compiled output); valid example, goal-only, null and omitted values passed, invalid blank/length/type/count cases were rejected. This is scoped example validation, not the full CLI test suite.
• Sitemap regeneration produced no changes.
• mint broken-links: passed, no broken links found.
• CI and rendered preview are not yet verified.

Source request: https://checklyhq.slack.com/archives/C0AHPMHJM7S/p1791972107071169

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