refactor: tighten pox-locking visibility

[simone-stacks]

Three pub fns in pox-locking's private modules (pox_lock_increase_v2, pox_lock_extend_v2 in pox_2.rs; pox_lock_v3 in pox_3.rs) have one in-module caller each. Drop pub to silence rustc's unreachable_pub. Since the containing modules are private (mod pox_2;, mod pox_3;), the items are structurally unreachable outside the crate — no API surface change.

Result of a first smoke-test of the quality-agent.

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