fix: load legacy deployed programs

[bmuddha]

What changed

• Build the processor's shared runtime as an execution environment so already-deployed legacy ELFs use Solana's lenient loading policy.
• Preserve strict verification for new deployments through the separately derived deployment environment.

Closes #91

Impact

LoaderV1 programs cloned from the base chain, including Memo v1, can load and execute. Modern programs, public APIs, and persisted data are unchanged.

Reviewer notes

The changed flag only controls execution-time ELF loading. deploy_program continues to force reject_broken_elfs = true before verifying newly deployed programs.

[coderabbitai]

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