Fix version assertion case sensitivity and Makefile.am texinfo filename inconsistency

[Copilot]

Two bugs in the e2e test suite and build system identified in review.

tests/e2e_cnee.sh — version assertion case mismatch

xnee_version() prints Xnee (capital X via PACKAGE), but assertions were matching lowercase xnee, causing false failures on case-sensitive grep. Updated to Xnee\|xnee alternation (the helper already converts \| to ERE |):

# Before
assert_output_contains "cnee --version prints 'xnee'" "xnee" "$CNEE" --version

# After
assert_output_contains "cnee --version prints 'xnee'" "Xnee\|xnee" "$CNEE" --version

cnee/src/Makefile.am — inconsistent generated filename in man target

The man target was generating cnee.texinfo, while BUILT_SOURCES, texi_TEXINFOS, CLEAN_FILES, and the standalone cnee.texi rule all use cnee.texi. This left cnee.texinfo uncleaned by make clean. Standardized the man target to output cnee.texi so it's covered by the existing CLEAN_FILES entry.

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[Copilot]

Pull request overview

This PR fixes two independent bugs: a case-sensitivity mismatch in the e2e test suite's version assertions, and an inconsistent generated filename in the cnee/src/Makefile.am man target.

Changes:

• Updated two assert_output_contains version assertions in tests/e2e_cnee.sh to use the alternation pattern Xnee\|xnee, matching the actual output of xnee_version() which prints PACKAGE (expanded as Xnee).
• Corrected the man target in cnee/src/Makefile.am to output cnee.texi instead of cnee.texinfo, aligning it with BUILT_SOURCES, CLEAN_FILES, texi_TEXINFOS, and the standalone cnee.texi rule.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
tests/e2e_cnee.sh	Fixes two version-check assertions to use case-insensitive alternation Xnee|xnee, preventing false failures when PACKAGE is Xnee.
cnee/src/Makefile.am	Fixes the man target to write cnee.texi instead of cnee.texinfo, eliminating the stale file left behind by make clean.

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