chore: release v0.3.0

[jackh726]

🤖 New release

• symposium-cargo: 0.2.0 -> 0.3.0 (⚠ API breaking changes)

⚠ symposium-cargo breaking changes

--- failure function_parameter_count_changed: pub fn parameter count changed ---

Description:
A publicly-visible function now takes a different number of parameters.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#fn-change-arity
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.46.0/src/lints/function_parameter_count_changed.ron

Failed in:
  symposium_cargo::cargo_mcp::build_mcp_server now takes 1 parameters instead of 0, in /tmp/.tmpVRBIf6/symposium-cargo/src/cargo_mcp.rs:81
  symposium_cargo::build_mcp_server now takes 1 parameters instead of 0, in /tmp/.tmpVRBIf6/symposium-cargo/src/cargo_mcp.rs:81

--- failure function_requires_different_generic_type_params: function now requires a different number of generic type parameters ---

Description:
A function now requires a different number of generic type parameters than it used to. Uses of this function that supplied the previous number of generic types (e.g. via turbofish syntax) will be broken.
        ref: https://doc.rust-lang.org/reference/items/generics.html
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.46.0/src/lints/function_requires_different_generic_type_params.ron

Failed in:
  function build_mcp_server (0 -> 1 generic types) in /tmp/.tmpVRBIf6/symposium-cargo/src/cargo_mcp.rs:81
  function build_mcp_server (0 -> 1 generic types) in /tmp/.tmpVRBIf6/symposium-cargo/src/cargo_mcp.rs:81

--- failure unit_struct_changed_kind: unit struct changed kind ---

Description:
A public unit struct has been changed to a normal (curly-braces) struct, which cannot be constructed using the same struct literal syntax.
        ref: https://github.com/rust-lang/cargo/pull/10871
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.46.0/src/lints/unit_struct_changed_kind.ron

Failed in:
  struct CargoProxy in /tmp/.tmpVRBIf6/symposium-cargo/src/lib.rs:13

Changelog

0.3.0 - 2026-03-19

Other

• Only run CI on pushes to main
• Upgrade sacp
• (untested) add ci and release-plz github actions
• Make binary be able to serve mcp server
• Run subagent after cargo test fail
• Review comments
• Auto prompt when project fails to build
• Add set_cwd tool so subsequent calls don't need to pass a cwd
• Add more cargo tools
• Add cargo add

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This PR was generated with release-plz.