chore: release v0.9.0

[github-actions]

🤖 New release

• rmcp-macros: 0.8.5 -> 0.9.0
• rmcp: 0.8.5 -> 0.9.0 (⚠ 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/v0.43.0/src/lints/constructible_struct_adds_field.ron

Failed in:
  field Tool.meta in /tmp/.tmptEJair/rust-sdk/crates/rmcp/src/model/tool.rs:37

Changelog

rmcp-macros

0.9.0 - 2025-11-17

Added

• (tool) add _meta to tool definitions (#534)

rmcp

0.9.0 - 2025-11-17

Added

• (auth) implement CredentialStore trait (#542)
• (tool) add _meta to tool definitions (#534)

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