License updates

[krebernisak]

• Add SPDX-License-Identifier to contracts
• Add contracts/LICENSE (BUSL-1.1)

[github-actions]

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[Copilot]

Pull request overview

This PR adds SPDX license identifiers to smart contract source files to improve license clarity and standardization. The changes apply license headers (MIT or BUSL-1.1) to Tolk and Tact contract files across the codebase.

Changes:

• Added SPDX-License-Identifier headers to all contract files
• Applied MIT license to library, test, and example contracts
• Applied BUSL-1.1 license to core CCIP and MCMS production contracts
• Removed trailing blank lines in some files

Reviewed changes

Copilot reviewed 94 out of 94 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
contracts/contracts/test/mock/*.tolk	Added MIT license headers to mock contracts
contracts/contracts/test/lib/*.tolk	Added MIT license headers to test library wrappers
contracts/contracts/test/examples/**/*.{tolk,tact}	Added MIT license headers to example contracts
contracts/contracts/mcms/*.tolk	Added BUSL-1.1 license headers to MCMS contracts
contracts/contracts/lib/**/*.tolk	Added MIT license headers to library modules
contracts/contracts/examples/**/*.tolk	Added MIT license headers to example contracts
contracts/contracts/deployable/*.tolk	Added MIT license headers to deployable contract modules
contracts/contracts/ccip/**/*.tolk	Added BUSL-1.1 license headers to CCIP contracts

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