feat(ci): enforce Rust 1.80 MSRV in Cargo manifests and GitHub Actions (Closes #650)

[stayzappy]

Summary

Closes #650

Key Changes Made

1. Declared Rust 1.80 MSRV:
   • Added rust-version = "1.80" to Cargo.toml, crates/starforge-plugin-sdk/Cargo.toml, and crates/starforge-wasm/Cargo.toml.
2. Configured GitHub Actions MSRV CI Job:
   • Added msrv verification job to .github/workflows/ci.yml using dtolnay/rust-toolchain@1.80.0 running cargo check --locked --workspace.
3. Workspace MSRV Compatibility Fixes:
   • Updated Migration trait method signatures in src/utils/database.rs (&mut Connection -> &Connection).
   • Exported missing modules and functions (pub mod ai_doc_qa, pub fn read_spec_entries).
   • Derived PartialEq, Eq on ComplianceSeverity.
   • Fixed test struct initializers across the workspace.

Verification

• cargo check --workspace passes cleanly with zero compilation errors.

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