chore: gate checks on cargo package

[tiye]

Summary

• add RFC 0106 for crate package verification
• include cargo package --locked in make check
• make CI compile the exact published package contents

Validation

• make check
• cargo package --locked
• git diff --check

This PR is stacked on PR #47 and should remain unmerged with the rest of the chain.

[Copilot]

Pull request overview

This PR adds a release-readiness gate to ensure the crate can be packaged according to Cargo’s publish manifest, and wires that check into the standard make check verification path (with accompanying RFC/documentation updates).

Changes:

• Add RFC 0106 describing a “crate package verification” acceptance gate.
• Extend make check to run cargo package --locked via a new make package target.
• Update project scope and README to reference RFC 0106 as the latest implemented RFC.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
RFCs/0106-package-verification-gate.md	Introduces the new package verification gate RFC and its rationale.
RFCs/0000-project-scope.md	Updates the “implemented RFCs up to …” statement to include RFC 0106.
README.md	Updates the RFC range reference to point to RFC 0106.
Makefile	Adds package target (cargo package --locked) and includes it in check.

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