Provide the V1 tokenizer inventory activation bridge

[i386]

Purpose

Provide the V1 native-serving-plugin activation contract for tokenizer-aware serving plugins.

Design

• Mesh materializes the complete native vocabulary while binding the source GGUF.
• ActivationContext carries a borrowed TokenizerInventoryView with native token IDs, byte pieces, and control-token identities.
• The host-owned view is valid for the activation call. A plugin copies or transforms the vocabulary before activate returns.
• The V1 plugin table is exported as mesh_native_serving_plugin_v1.
• Mesh retains ownership of model execution, verification, lifecycle ordering, and the absolute proposal deadline.

Use

A tokenizer-aware plugin can build an immutable native-token table during activation. Vocabulary discovery and table construction therefore complete before the proposal/decode path.

Dependency

This draft is based on #1149, which provides the native serving-plugin host and generation lifecycle.

Validation

• just with-lld cargo test -p model-artifact -p mesh-native-serving-plugin-host -p skippy-server
• just with-lld cargo clippy -p model-artifact -p mesh-native-serving-plugin-host -p skippy-server -- -D warnings

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This pull request is currently a draft. Reviews will not take place until the PR is marked as ready for review.