Rebrand Phase 2: Update Rust crate names

[JustAGhosT]

Context

NexaMesh rebrand — Rust workspace crate rename.

Files to Update

• crates/phoenix-common/Cargo.toml — phoenix-common → nexamesh-common
• Root Cargo.toml — workspace member references
• All Cargo.toml files that depend on phoenix-common
• All Rust use / extern crate statements referencing phoenix_common

Verification

• cargo build succeeds
• cargo test passes
• cargo clippy -- -D warnings passes

[blocksorg]

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