Normalize artifact line endings and Gherkin formatting

[LarryHu0217]

What type of PR is this?

• correction
• cleanup

What this PR does / why we need it:

Normalizes the common artifacts so their checked-in formatting matches the CAMARA lint configuration:

• adds the proposed root .gitattributes policy to keep text files on LF and protect binary formats from conversion
• normalizes the four CRLF artifact files identified in Normalize line endings of the artifacts to LF and add a .gitattributes #674 to LF
• fixes the 121 Gherkin indentation findings and 7 trailing-space findings identified in Feature file templates: mechanical lint cleanup (indentation, trailing spaces) #675

The Gherkin scenarios, steps, examples, and YAML values are unchanged.

Which issue(s) this PR fixes:

Fixes #674
Fixes #675

Does this PR introduce a breaking change?

• Yes
• No

Special notes for reviewers:

This PR depends on #673, which introduces the Artifacts Lint workflow. I validated the combined #673 + this PR state locally with the same v1-rc tooling pins:

• yamllint over artifacts/: pass
• Spectral over API and notification templates: 0 errors
• gplint over feature templates: 0 errors; 16 expected template warnings remain for Document the expected lint warnings of the artifacts (fix-or-document standard) #676 to document
• git diff --ignore-all-space over all changed artifacts: no content differences
• git diff --check: pass

Before this change, gplint reported 144 warnings. The remaining 16 are the 10 duplicate-scenario-name and 6 unused-template-variable warnings described in #676.

Changelog input

 release-note
- Normalized common artifact line endings to LF and added repository-level Git attributes
- Aligned Gherkin feature template indentation and trailing whitespace with CAMARA lint rules

Additional documentation

This section can be blank.

docs

[hdamker]

Verified independently against main:

• git diff -w shows only the new .gitattributes (byte-identical to the template proposed in camaraproject/tooling#112) - everything else is pure line-ending/whitespace normalization, no content changes
• all four CRLF files are LF now
• gplint: the 128 mechanical findings are gone; exactly the 16 template-natured warnings remain (to be documented via #676)
• the remaining yamllint finding (trailing space in Github_templates) is pre-existing on main and fixed by #673

Merge order: #673 goes first; after a rebase the new Artifacts Lint check runs directly on this PR - expected green.

Thanks @LarryHu0217 - also for including the validation against the pinned toolchain.

[PedroDiez]

LGTM

[bigludo7]

LGTM

[LarryHu0217]

The prerequisite #673 has merged, and this PR is approved, mergeable, and passing its current checks. Please let me know if any further validation or update is needed before merge.

[rartych]

@LarryHu0217 Thank you for updating this PR.
Some earlier prepared PRs have been merged creating new conflicts.
Since the changes here are rather mechanical, I suppose it would be easier to merge #670 and #680 first and then do the final update here. Thank you for your understanding!

[LarryHu0217]

Rebased on current main and resolved the conflict by retaining the upstream content updates. This PR now applies only the intended .gitattributes and Gherkin formatting changes; the artifact lint check is running.

[hdamker]

LGTM - whitespace changes only plus the new file .gitattributes.

[hdamker]

@camaraproject/commonalities_codeowners Please re-review and approve the PR, so that @rartych can merge it and I can rebase #683 on main branch and open for review.

[PedroDiez]

LGTM

[rartych]

LGTM