fix: preserve stdin taskfile bytes

[cuishuang]

• I have read and followed the Contribution Guide

StdinNode.Read used bufio.Scanner to read a Taskfile line by line.

Scanner has a default maximum token size of 64 KiB, so a Taskfile containing a longer line failed with:

bufio.Scanner: token too long

The previous implementation also removed the original line endings and added \n after every scanned line. This converted CRLF input to LF and added a trailing newline when the input did not contain one.

This differed from regular Taskfile reads, which use io.ReadAll and preserve the input bytes.

[Copilot]

Pull request overview

This PR updates StdinNode.Read to preserve raw Taskfile bytes read from stdin by switching from line-based bufio.Scanner parsing to io.ReadAll, avoiding the 64 KiB scanner token limit and preserving original line endings and trailing newline behavior.

Changes:

• Replace bufio.Scanner usage with io.ReadAll(os.Stdin) in StdinNode.Read.
• Add tests ensuring stdin reads preserve bytes for long lines, CRLF endings, missing trailing newline, and empty input.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
taskfile/node_stdin.go	Switch stdin Taskfile reading to io.ReadAll to preserve bytes and avoid scanner limits.
taskfile/node_stdin_test.go	Add coverage for byte-preserving stdin reads across edge cases.

Suppressed comments (1)

taskfile/node_stdin_test.go:53

• Use filepath.Join here to build the temp file path in an OS-agnostic way (avoids hardcoding "/").

	path := t.TempDir() + "/stdin"

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