chore: complete 0.3.0 release prep across the workspace

The previous bump commit (330062a) was empty; this fills in the actual
manifest changes plus the fixes needed for release-plz to succeed.

- Bump all crates to 0.3.0 and update intra-workspace dep version
  requirements accordingly.
- Bump a2a-mcp from 0.1.0 to 0.3.0 to line up with the rest of the
  workspace; add it to its CHANGELOG.
- Fix a2a-mcp/Cargo.toml so it is publishable: real repository URL,
  pin a2a-agents-common with version="0.3", set rust-version, switch
  license to MIT, drop the invalid `ai` category, set author.
- Fix the auto-generated compare links in each crate CHANGELOG to point
  at ...v0.3.0 instead of the stale ...v0.2.1.
- Refresh Cargo.lock for the version bumps.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: EmilLindfors

Cargo.lock

@@ -7,7 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-## [0.2.1](https://github.com/EmilLindfors/a2a-rs/compare/a2a-agents-common-v0.2.0...a2a-agents-common-v0.2.1) - 2026-05-27
+## [0.3.0](https://github.com/EmilLindfors/a2a-rs/compare/a2a-agents-common-v0.2.0...a2a-agents-common-v0.3.0) - 2026-05-27
 
 ### Fixed
 

a2a-agents-common/CHANGELOG.md

@@ -1,6 +1,6 @@
 [package]
 name = "a2a-agents-common"
-version = "0.2.1"
+version = "0.3.0"
 edition = "2024"
 rust-version = "1.85"
 authors = ["Emil Lindfors <emil@lindfors.no>"]
@@ -47,7 +47,7 @@ rustdoc-args = ["--cfg", "docsrs"]
 
 [dev-dependencies]
 tokio = { version = "1.32", features = ["rt", "macros", "test-util"] }
-a2a-agents = { path = "../a2a-agents", version = "0.2" }
+a2a-agents = { path = "../a2a-agents", version = "0.3" }
 
 [[test]]
 name = "integration_test"

a2a-agents-common/Cargo.toml

@@ -7,7 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-## [0.2.1](https://github.com/EmilLindfors/a2a-rs/compare/a2a-agents-v0.2.0...a2a-agents-v0.2.1) - 2026-05-27
+## [0.3.0](https://github.com/EmilLindfors/a2a-rs/compare/a2a-agents-v0.2.0...a2a-agents-v0.3.0) - 2026-05-27
 
 ### Fixed
 

a2a-agents/CHANGELOG.md

@@ -1,6 +1,6 @@
 [package]
 name = "a2a-agents"
-version = "0.2.1"
+version = "0.3.0"
 edition = "2024"
 rust-version = "1.85"
 authors = ["Emil Lindfors <emil@lindfors.no>"]
@@ -11,11 +11,11 @@ keywords = ["a2a", "agent", "framework", "toml"]
 categories = ["api-bindings", "network-programming"]
 
 [dependencies]
-a2a-rs = { path = "../a2a-rs", version = "0.2", features = ["server", "http-server", "tracing"] }
-a2a-agents-common = { path = "../a2a-agents-common", version = "0.2" }
-a2a-ap2 = { path = "../a2a-ap2", version = "0.2", optional = true }
-a2a-client = { package = "a2a-web-client", path = "../a2a-client", version = "0.2" }
-a2a-mcp = { path = "../a2a-mcp", version = "0.1", optional = true }
+a2a-rs = { path = "../a2a-rs", version = "0.3", features = ["server", "http-server", "tracing"] }
+a2a-agents-common = { path = "../a2a-agents-common", version = "0.3" }
+a2a-ap2 = { path = "../a2a-ap2", version = "0.3", optional = true }
+a2a-client = { package = "a2a-web-client", path = "../a2a-client", version = "0.3" }
+a2a-mcp = { path = "../a2a-mcp", version = "0.3", optional = true }
 rmcp = { version = "1.7", features = ["server", "client", "transport-io", "transport-child-process"], optional = true }
 
 # Core dependencies

a2a-agents/Cargo.toml

@@ -7,7 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-## [0.2.1](https://github.com/EmilLindfors/a2a-rs/compare/a2a-ap2-v0.2.0...a2a-ap2-v0.2.1) - 2026-05-27
+## [0.3.0](https://github.com/EmilLindfors/a2a-rs/compare/a2a-ap2-v0.2.0...a2a-ap2-v0.3.0) - 2026-05-27
 
 ### Other
 

a2a-ap2/CHANGELOG.md

@@ -1,6 +1,6 @@
 [package]
 name = "a2a-ap2"
-version = "0.2.1"
+version = "0.3.0"
 edition = "2024"
 rust-version = "1.85"
 authors = ["Emil Lindfors <emil@lindfors.no>"]
@@ -14,7 +14,7 @@ categories = ["api-bindings", "network-programming"]
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 thiserror = "1.0"
-a2a-rs = { path = "../a2a-rs", version = "0.2" }
+a2a-rs = { path = "../a2a-rs", version = "0.3" }
 buffa = { version = "0.3.0", features = ["json"] }
 buffa-types = { version = "0.3.0", features = ["json"] }
 

a2a-ap2/Cargo.toml

@@ -7,7 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-## [0.2.1](https://github.com/EmilLindfors/a2a-rs/compare/a2a-web-client-v0.2.0...a2a-web-client-v0.2.1) - 2026-05-27
+## [0.3.0](https://github.com/EmilLindfors/a2a-rs/compare/a2a-web-client-v0.2.0...a2a-web-client-v0.3.0) - 2026-05-27
 
 ### Other
 

a2a-client/CHANGELOG.md

@@ -1,6 +1,6 @@
 [package]
 name = "a2a-web-client"
-version = "0.2.1"
+version = "0.3.0"
 edition = "2024"
 rust-version = "1.85"
 authors = ["Emil Lindfors <emil@lindfors.no>"]
@@ -16,7 +16,7 @@ name = "a2a_client"
 [dependencies]
 # A2A integration
 # Note: We need "server" feature for the port traits even though this is a client library
-a2a-rs = { path = "../a2a-rs", version = "0.2", features = ["http-client", "server", "tracing"], default-features = false }
+a2a-rs = { path = "../a2a-rs", version = "0.3", features = ["http-client", "server", "tracing"], default-features = false }
 buffa = { version = "0.3.0", features = ["json"] }
 
 # Async runtime

a2a-client/Cargo.toml

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.3.0](https://github.com/EmilLindfors/a2a-rs/compare/a2a-mcp-v0.1.0...a2a-mcp-v0.3.0) - 2026-05-27
+
 ### Changed - Breaking
 
 - **`McpToA2ABridge` tool-call wire format replaced.** The bridge no longer