refactor: remove the unnecessary tool and parameter, implement unit tests

[Fine0830]

• Remove the set_skywalking_url tool and SW-URL parameter.
• Validate properties for tools.
• Implement unit tests.

Signed-off-by: Qiuxia Fan qiuxiafan@apache.org

[Copilot]

Pull request overview

Refactors network transports to stop accepting the SW-URL request header (SSE/HTTP now always use the configured --sw-url/default), and introduces unit tests + CI coverage to lock in the intended URL/auth/session behavior.

Changes:

• Removed SW-URL header-based URL resolution for SSE/HTTP contexts; always use configuredSkyWalkingURL().
• Added unit tests covering URL finalization, ${ENV_VAR} credential resolution, session override behavior, and server registry expectations.
• Added make test / make test-cover targets and wired make test into the CI workflow; updated docs to match the new transport behavior.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
internal/swmcp/server.go	Removes header-based URL selection and updates SSE/HTTP context enrichment to use CLI-configured URL/auth only.
internal/swmcp/session.go	Updates the session tool help text to remove references to SW-URL headers.
internal/swmcp/server_test.go	Adds tests for configured URL, env var resolution, configured auth injection, and session override semantics.
internal/swmcp/server_registry_test.go	Adds tests asserting expected tool/prompt/resource registration (currently via reflect/unsafe).
README.md	Documents updated URL behavior across stdio, sse, and streamable transports.
Makefile	Adds test and test-cover targets and exposes flags/package selectors.
CLAUDE.md	Updates documentation around transport URL priority and existence of unit tests.
.github/workflows/CI.yaml	Runs make test as part of the CI build job.

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