fix(ci): cap broken AI SDK v6 patches

[mattzcarey]

Summary

Temporarily cap the AI SDK v6 compatibility lane at the last known-good patch:

>=6.0.0 <6.0.260

This changes only the throwaway dependency range written by scripts/use-ai-sdk-major.mjs. Published peer ranges and the repository lockfile are unchanged.

Why

The compatibility workflow uses pnpm install --no-frozen-lockfile, so ai@^6.0.0 began resolving newly published patches during existing PR runs.

Observed behavior:

• ai@6.0.259: Think Workers 886/886
• ai@6.0.260: 16 deterministic failures in client-tool and HITL tests
• ai@6.0.261: same 16 failures
• ai@6.0.263: same 16 failures

The failure reproduces on current main, so it is not caused by the PR that first exposed it. The affected tool results remain at input-available, and RPC client-tool executors are not invoked.

The cap keeps testing the supported v6 line without silently dropping AI v6 coverage. It should be removed or advanced when an upstream patch restores the affected behavior.

Verification

• compatibility script rewrites every targeted ai dependency to >=6.0.0 <6.0.260
• pnpm resolves that range to ai@6.0.259
• exact Think Workers compatibility lane: 44 files, 886 tests passed
• script syntax, Oxfmt, Oxlint, and git diff --check pass

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