fix(schema): respect maxItems and avoid crash on minItems>=3 in example generator

[devteamaegis]

What's broken

gen_array in guardrails/schema/generator.py reads the array upper bound from maxItem, but the JSON Schema keyword is maxItems (also what the function's docstring claims to support). Two effects:

1. A schema's maxItems is silently ignored — the generator always uses the default cap of 2.
2. Any array schema with minItems >= 3 crashes with ValueError: empty range in randrange(...), because randint(min_items, 2) is called with min_items > 2.

generate_example is invoked during reask setup (guardrails/actions/reask.py), so a guard with a minItems >= 3 array field raises on reask.

generate_example({"type":"array","items":{"type":"string"},"minItems":5,"maxItems":10})
# ValueError: empty range in randrange(5, 3)

Why it happens

Misspelled schema key maxItem (should be maxItems) pins the upper bound to the default 2, so maxItems is never read and randint(min_items, 2) blows up whenever minItems > 2.

Fix

Read maxItems (correct key), default it to max(minItems, 2), and clamp max_items = max(min_items, max_items) so a user-supplied minItems > maxItems can't make randint raise.

Test

Added a parametrized test covering the crash case, the previously-ignored maxItems, and a tight maxItems:1 bound. Fails before the change (2 failures), passes after.

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