feat(ruby): M6a — ast-grep parity lanes

[filip-michalsky]

Part of the AP-2857 parity stack:

Stack: #2820 (spike) ← #2854 (M1–M2) ← #2855 (M3) ← #2851 (M4) ← #2857 (M5) ← this PR (M6a)

Adds @ast-grep/lang-ruby and Ruby lanes to the cross-language drift checks, holding the Ruby SDK to the same bar as Python/Go:

• rpc-parity — lifecycle capabilities (send/on_request/on_notification/receive/close), JSON-RPC error codes, notification buffer bound
• cdp-parity — transport lifecycle, page.on / CDPSubscription#unsubscribe, extension discovery + runtime bridging tokens
• example-parity — example inventory equality with TS/Python/Go, per-example public SDK operation lists, lifecycle checks
• sdk-parity — a dedicated Ruby section: references all 77 registered operations; outbound set == extension router and inbound == TS inbound; notification coverage; per-class RPC-backed operations, public callable surface, and Stagehand accessors compared against TypeScript; and params-model + result-descriptor validation at every RPC call site. (Ruby has no in-source type annotations — RBS covers that — so the typed-parameter checks intentionally remain TS/Python/Go.)

SDK changes the lanes forced (real parity findings)

• Inlined @rpc_client.send("<wire.method>", …) per public method, removing the navigate/void helpers — wire methods are now statically visible per method, matching how the sibling SDKs are written.
• Removed Client#context — TS/Python deliberately do not expose context on Stagehand (the accessor lane rejects it).
• The canonical 11 examples are now self-contained (inventory + operations parity); Ruby-only walkthroughs moved to examples/extras/ with the shared helper.

Not in this PR

sdk-field-pipeline and sdk-client-schema-parity Ruby lanes land with the docs tabs (M6b) — those suites also validate documentation pages.

Verification

• All 9 ast-grep suites green: 52 tests (up from 42)
• Ruby suite still green: 120 runs / 803 assertions + RBS validation
• Live on local Chrome after the send-inlining: batch.rb, file_upload.rb, extras/context_and_response.rb

🤖 Generated with Claude Code

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	npm/​@​ast-grep/​lang-ruby@​0.0.7

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