Create a Makefile for common developer commands

[Nursca]

Description
Developers have to remember multiple cargo commands for building, testing, formatting, and deploying. A Makefile with well-named targets makes the development workflow much more ergonomic.

Requirements and context

• make build — build optimised WASM
• make test — run full test suite
• make fmt — format code
• make lint — run clippy
• make deploy-testnet — deploy to testnet
• make coverage — run tarpaulin coverage
• Document all targets in Makefile with comments

Suggested execution

git checkout -b chore/makefile

• Create Makefile at repo root
• Write all targets
• Test each on a clean checkout
• Document in README

Example commit message
chore: add Makefile with common developer workflow targets

[khanavi272-spec]

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[Emelie-Dev]

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[Daveside9]

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can i do this? merge in 2hours.

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