fix(ci): replace semantic-release action with CLI

[mrgoonie]

Summary

• Remove go-semantic-release/action@v1 from the release workflow to eliminate the remaining Node 20 action annotation.
• Install github.com/go-semantic-release/semantic-release/v2/cmd/semantic-release@v2.31.0 with Go and run the CLI directly.
• Preserve beta/stable behavior, changelog prepending, no-change success, GoReleaser hooks, and CHANGELOG.md upload by deriving the created release tag after semantic-release runs.
• Update deployment guide release workflow docs.

Validation

• YAML parse for all workflow files
• /usr/local/go/bin/go test -count=1 ./...
• /usr/local/go/bin/go vet ./...
• /usr/local/go/bin/go build ./...
• git diff --check
• go install github.com/go-semantic-release/semantic-release/v2/cmd/semantic-release@v2.31.0 and semantic-release --help

Notes

• PR fix(ci): run release workflows on Node 24 actions #11 already upgraded actions/checkout and actions/setup-go to Node 24 runtimes.
• This PR removes the last release-path Node 20 action instead of forcing it onto Node 24.