Fix Azure Foundry Anthropic strict tools

[roboomp]

Repro

Azure Foundry Anthropic Sonnet 5 utility requests fail with 400 structured_outputs not supported in your workspace because the route receives Anthropic strict-tool structured-output framing. Reproduced with bun test packages/ai/test/issue-4679-repro.test.ts before the fix: Azure Foundry Anthropic compat resolved disableStrictTools as false.

Cause

packages/catalog/src/compat/anthropic.ts recognized Azure AI Inference / Foundry Anthropic URLs as signing endpoints but still set ResolvedAnthropicCompat.disableStrictTools to false. packages/ai/src/providers/anthropic.ts then built OAuth utility headers through buildClaudeCodeBetas without considering strict-tool disablement, so structured-outputs-2025-12-15 remained in anthropic-beta even when strict tools were intended to be removed.

Fix

• Detect Azure AI Inference / Foundry Anthropic routes as strict-tool-incompatible in buildAnthropicCompat.
• Thread disableStrictTools into Anthropic client option/header construction.
• Omit structured-outputs-2025-12-15 from Claude Code OAuth beta defaults when strict tools are disabled.
• Add regression coverage for both Azure Foundry host shapes, direct Anthropic beta retention, and strict tool-schema omission.

Verification

Focused tests passed: bun test packages/ai/test/issue-4679-repro.test.ts (4 pass, 10 assertions), bun test packages/ai/test/issue-826-repro.test.ts (4 pass, 7 assertions), and bun test packages/catalog/test/issue-4297-repro.test.ts (10 pass, 22 assertions). gh_push_branch also completed its pre-publish gate and pushed farm/d5df12c6/sonnet-5-azure-foundry. Fixes #4679

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[roboomp]

No code change requested by the Codex quota notice. PR #4682 remains ready for maintainer review; repo admins need to enable Codex review credits if they want the automated review to run.