chore: release v0.15.0

[github-actions]

🤖 New release

• rmcp-macros: 0.14.0 -> 0.15.0
• rmcp: 0.14.0 -> 0.15.0 (⚠ 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/v0.46.0/src/lints/constructible_struct_adds_field.ron

Failed in:
  field ServerCapabilitiesBuilder.extensions in /tmp/.tmpy53KuI/rust-sdk/crates/rmcp/src/model/capabilities.rs:387
  field CreateMessageRequestParams.tools in /tmp/.tmpy53KuI/rust-sdk/crates/rmcp/src/model.rs:1559
  field CreateMessageRequestParams.tool_choice in /tmp/.tmpy53KuI/rust-sdk/crates/rmcp/src/model.rs:1562
  field CreateMessageRequestParams.tools in /tmp/.tmpy53KuI/rust-sdk/crates/rmcp/src/model.rs:1559
  field CreateMessageRequestParams.tool_choice in /tmp/.tmpy53KuI/rust-sdk/crates/rmcp/src/model.rs:1562
  field ClientCapabilitiesBuilder.extensions in /tmp/.tmpy53KuI/rust-sdk/crates/rmcp/src/model/capabilities.rs:461
  field ServerCapabilities.extensions in /tmp/.tmpy53KuI/rust-sdk/crates/rmcp/src/model/capabilities.rs:267
  field ClientCapabilities.extensions in /tmp/.tmpy53KuI/rust-sdk/crates/rmcp/src/model/capabilities.rs:230
  field SamplingMessage.meta in /tmp/.tmpy53KuI/rust-sdk/crates/rmcp/src/model.rs:1371
  field Tool.execution in /tmp/.tmpy53KuI/rust-sdk/crates/rmcp/src/model/tool.rs:34

--- failure inherent_method_missing: pub method removed or renamed ---

Description:
A publicly-visible method or associated fn is no longer available under its prior name. It 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/v0.46.0/src/lints/inherent_method_missing.ron

Failed in:
  OperationProcessor::collect_completed_results, previously in file /tmp/.tmpxyZXUB/rmcp/src/task_manager.rs:198

--- failure method_receiver_ref_became_mut: method receiver changed from immutable to mutable reference ---

Description:
A method's receiver changed from an immutable reference to a mutable one.
        ref: https://doc.rust-lang.org/reference/items/associated-items.html#methods
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.46.0/src/lints/method_receiver_ref_became_mut.ron

Failed in:
  rmcp::task_manager::OperationProcessor::running_task_count now takes &mut Self, not &Self, in /tmp/.tmpy53KuI/rust-sdk/crates/rmcp/src/task_manager.rs:232
  rmcp::task_manager::OperationProcessor::list_running now takes &mut Self, not &Self, in /tmp/.tmpy53KuI/rust-sdk/crates/rmcp/src/task_manager.rs:247
  rmcp::task_manager::OperationProcessor::peek_completed now takes &mut Self, not &Self, in /tmp/.tmpy53KuI/rust-sdk/crates/rmcp/src/task_manager.rs:253

Changelog

rmcp-macros

0.15.0 - 2026-02-06

Fixed

• (tasks) avoid dropping completed task results during collection (#639)
• (tasks) expose execution.taskSupport on tools (#635)

rmcp

0.15.0 - 2026-02-06

Added

• add native-tls as an optional TLS backend (#631)
• (capabilities) add extensions field for SEP-1724 (#643)

Fixed

• (tasks) avoid dropping completed task results during collection (#639)
• (auth) oauth metadata discovery (#641)
• compilation with --no-default-features (#593)
• (tasks) expose execution.taskSupport on tools (#635)
• (tasks) correct enum variant ordering for deserialization (#634)

Other

• Implement SEP-1577: Sampling With Tools (#628)

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