🐛 Jump PRNG in infiniteStream loop before generate

[Copilot]

The PRNG was not being advanced before generating values in the infiniteStream loop, causing inconsistency with the toss mechanism in Tosser.ts.

Changes

• Added unsafeJump() to Random class: Advances internal RNG by 42 values using unsafeSkipN, matching the jump behavior in Tosser.ts
• Call unsafeJump() before generate() in infiniteStream: In StreamArbitrary, the PRNG now jumps before each arb.generate() call in the infinite stream generator loop
• Updated test infrastructure: Added unsafeJump mock to RandomHelpers and updated snapshots for infiniteStream tests reflecting the new value sequences

The jump amount (42) is consistent with existing usage in QualifiedParameters.ts and Tosser.ts. The fix is restricted to the infiniteStream code only, not affecting the general GeneratorArbitrary behavior.

Original prompt

solve #5054 by jumping in the prng before returning on generate

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[dubzzz]

@copilot Restrict the jump to the infiniteStream code

[Copilot]

Done! The PRNG jump is now restricted to the infiniteStream loop in StreamArbitrary.ts (line 33). Changes committed in 57fcb44.