chore: release v0.12.0

[github-actions]

🤖 New release

• rmcp-macros: 0.11.0 -> 0.12.0
• rmcp: 0.11.0 -> 0.12.0 (⚠ API breaking changes)

⚠ rmcp breaking changes

--- failure constructible_struct_adds_field: externally-constructible struct adds field ---

Description:
A pub struct constructible with a struct literal has a new pub field. Existing struct literals must be updated to include the new field.
        ref: https://doc.rust-lang.org/reference/expressions/struct-expr.html
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.45.0/src/lints/constructible_struct_adds_field.ron

Failed in:
  field AuthorizationMetadata.response_types_supported in /tmp/.tmpKi9zTS/rust-sdk/crates/rmcp/src/transport/auth.rs:165

--- failure function_missing: pub fn removed or renamed ---

Description:
A publicly-visible function cannot be imported by its prior path. A `pub use` may have been removed, or the function itself may have been renamed or removed entirely.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.45.0/src/lints/function_missing.ron

Failed in:
  function rmcp::handler::server::common::cached_schema_for_type, previously in file /tmp/.tmpzFBOkg/rmcp/src/handler/server/common.rs:30
  function rmcp::handler::server::tool::cached_schema_for_type, previously in file /tmp/.tmpzFBOkg/rmcp/src/handler/server/common.rs:30

--- failure method_parameter_count_changed: pub method parameter count changed ---

Description:
A publicly-visible method 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/v0.45.0/src/lints/method_parameter_count_changed.ron

Failed in:
  rmcp::transport::auth::AuthorizationSession::new now takes 5 parameters instead of 4, in /tmp/.tmpKi9zTS/rust-sdk/crates/rmcp/src/transport/auth.rs:975
  rmcp::transport::AuthorizationSession::new now takes 5 parameters instead of 4, in /tmp/.tmpKi9zTS/rust-sdk/crates/rmcp/src/transport/auth.rs:975

Changelog

rmcp-macros

0.12.0 - 2025-12-10

Other

• merge cached_schema_for_type into schema_for_type (#581)
• Add NexusCore MCP to project list (#573)
• (deps) update darling requirement from 0.21 to 0.23 (#574)

rmcp

0.12.0 - 2025-12-10

Fixed

• (oauth) rfc8414 should judement the response_types (#485)

Other

• Add SEP-991 (CIMD) support for URL-based client IDs (#570)
• merge cached_schema_for_type into schema_for_type (#581)
• Add NexusCore MCP to project list (#573)

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This PR was generated with release-plz.