chore: remove redundant SPDX license headers

[slin1237]

Description

Problem

Files under crates/engine_zmq_client/ and model_gateway/src/routers/grpc/zmq_client.rs
carry a per-file // SPDX-License-Identifier: Apache-2.0 header. These are
redundant: every crate's Cargo.toml already declares license = "Apache-2.0"
and the repo ships a root LICENSE file. They're also inconsistent with the
rest of the tree — no other source file carries one.

Solution

Strip the redundant SPDX headers (23 files).

The NVIDIA proto (crates/grpc_client/proto/trtllm_service.proto) keeps its
header intentionally: it carries a third-party copyright notice
(Copyright (c) 2024 NVIDIA CORPORATION) that Apache-2.0 section 4 requires
preserving.

Test Plan

Comment-only deletions; no behavior change.

• cargo +nightly fmt --all -- --check passes
• cargo clippy -p engine-zmq-client --all-targets --all-features -- -D warnings passes

Checklist

• cargo +nightly fmt passes
• cargo clippy --all-targets --all-features -- -D warnings passes
• (Optional) Documentation updated
• (Optional) Please join us on Slack #sig-smg to discuss, review, and merge PRs

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Review details

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Run ID: 0da40c28-b398-40e3-b8b9-26a06d967b69

📥 Commits

Reviewing files that changed from the base of the PR and between 3f701a3 and a57725c.

📒 Files selected for processing (23)

• crates/engine_zmq_client/examples/live_probe.rs
• crates/engine_zmq_client/src/codec/dtype.rs
• crates/engine_zmq_client/src/codec/mod.rs
• crates/engine_zmq_client/src/codec/tensor.rs
• crates/engine_zmq_client/src/connector.rs
• crates/engine_zmq_client/src/error.rs
• crates/engine_zmq_client/src/lib.rs
• crates/engine_zmq_client/src/mock_engine.rs
• crates/engine_zmq_client/src/protocol/handshake.rs
• crates/engine_zmq_client/src/protocol/mod.rs
• crates/engine_zmq_client/src/protocol/tokenspeed/mod.rs
• crates/engine_zmq_client/src/protocol/tokenspeed/output.rs
• crates/engine_zmq_client/src/protocol/tokenspeed/request.rs
• crates/engine_zmq_client/src/protocol/tokenspeed/sampling.rs
• crates/engine_zmq_client/src/protocol/vllm/logprobs.rs
• crates/engine_zmq_client/src/protocol/vllm/lora.rs
• crates/engine_zmq_client/src/protocol/vllm/mod.rs
• crates/engine_zmq_client/src/protocol/vllm/output.rs
• crates/engine_zmq_client/src/protocol/vllm/request.rs
• crates/engine_zmq_client/src/protocol/vllm/sampling.rs
• crates/engine_zmq_client/src/protocol/vllm/stats.rs
• crates/engine_zmq_client/src/transport.rs
• model_gateway/src/routers/grpc/zmq_client.rs

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[claude]

👋 The PR description doesn't fully follow
PULL_REQUEST_TEMPLATE.md:

• Missing header: ## Changes

Please update the PR description so reviewers have the context they need.

[claude]

Clean comment-only removal of redundant SPDX headers — no issues found. All 23 files only lose the // SPDX-License-Identifier: Apache-2.0 line while correctly preserving attribution/provenance comments. License coverage via Cargo.toml + root LICENSE file is sufficient.