fix: tolerate missing created_at/updated_at in LinkedAccount responses

[mstrivens]

Problem

accounts.list_linked_accounts (GET /accounts) fails to deserialize on every call for some providers. Reported against 0.40.1; still broken on 0.41.0 (fails differently — see below).

Root cause is a spec-vs-reality mismatch on the nested LinkedAccount:

• The spec marks created_at and updated_at as required + non-nullable.
• The live API omits them for some providers (the bug report's linkedin_lms example has neither).

Crystalline's strict from_dict raises KeyError: key created_at not found in hash while building each nested LinkedAccount. The /accounts 200 response is a oneOf whose branches both wrap LinkedAccount, so both fail and the whole page is lost over two absent timestamps on one record:

	0.40.1	0.41.0
Unmarshal target	bare Array<LinkedAccount>	Union<LinkedAccountsPaginated, Array<LinkedAccount>>
Failure	TypeError raised	returns nil silently

Evidence the report's example is a real capture, not trimmed: it includes a metadata field that isn't in the OpenAPI schema at all.

Fix

Overlay actions that make created_at/updated_at nullable and drop them from LinkedAccount.required, so the generated model deserializes accounts that lack them. (Both changes are needed: nullable alone leaves them keyword-required in the constructor → ArgumentError.)

Verification

Regenerated locally (speakeasy 1.638.0, lint 0 errors, SDK generated successfully) and deserialized:

• the exact payload from the bug report (timestamps absent) → LinkedAccountsPaginated, data.size=1, timestamps nil ✓
• a full payload with timestamps → parses them correctly ✓
• the bare-array oneOf branch → Array<LinkedAccount> ✓

Follow-up (not in this PR)

Stopgap in the Ruby overlay. The real fix belongs in the OAS producer (unified-cloud-api): either always return created_at/updated_at, or mark them nullable there — that covers the TS and PHP SDKs too, which have the same latent break.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR updates the Speakeasy Ruby overlay to align the generated LinkedAccount model with observed /accounts API responses that sometimes omit created_at and updated_at, preventing deserialization failures when those timestamps are missing.

Changes:

• Marks LinkedAccount.created_at and LinkedAccount.updated_at as nullable.
• Removes created_at/updated_at from LinkedAccount.required and redefines the remaining required fields to keep the model constructible when timestamps are absent.

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[CameronCarlin]

lgtm