Context

PR #1966 (structural code organization) introduced zeph-common crate with truncate_to_bytes. However, truncate_chars/truncate_to_chars remains duplicated between zeph-core::text and zeph-common::text.

Found by: impl-critic (IMP-01)

Problem

• zeph-core::text::truncate_chars and zeph-common::text::truncate_to_chars implement the same logic
• zeph-core does not depend on zeph-common (Layer 2 vs Layer 0), so the consolidation requires either:
  • Adding zeph-common as a dependency of zeph-core, or
  • Moving truncate_chars to zeph-common and re-exporting from zeph-core

Acceptance criteria

• Single implementation of char-based truncation
• No code duplication between crates
• Layered architecture preserved (Layer 0 → Layer 2 dependency direction)