P-2379 Correct CLI filter examples

[yosriady]

Summary

• correct segment examples to use the public field::op::value DSL
• describe --filter-sets as the segment create-request filterSets input
• document passing page_scope through analytics --params
• add a page-filtered KPI example to README and generated skill guidance

Validation

• 156 unit tests passed
• lint passed
• typecheck passed

Live integration tests remain skipped because no valid TEST_TOKEN is configured.

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[linear-code]

P-2379