fix: correct truncated help text for schema load/check commands

[qduk]

Why

The infrahubctl schema command list truncated the load and check
descriptions mid-sentence ("Load one or multiple schema files into...",
"Check if schema files are valid and what..."). This came from Click's
default short-help generation, which truncates the first line of a
command's docstring at 45 characters when no explicit short_help is
set — both docstrings exceed that limit.

What changed

• Set explicit short_help strings on the schema load and schema check
  Typer commands in infrahub_sdk/ctl/schema.py so Click no longer falls
  back to its 45-character auto-truncation.
• Regenerated docs/docs/infrahubctl/infrahubctl-schema.mdx via
  uv run invoke docs-generate to pick up the fix.
• Added a changelog fragment.

What stayed the same: No other commands, options, or behavior changed —
this only affects the one-line summary shown in --help and the generated
docs.

How to review

• infrahub_sdk/ctl/schema.py — the two short_help= additions.
• docs/docs/infrahubctl/infrahubctl-schema.mdx — regenerated, diff is
  two lines.

How to test

uv run infrahubctl schema --help

Confirm the load and check lines read as complete sentences.

Impact & rollout

• Backward compatibility: None — cosmetic help-text change only.
• Performance: N/A
• Config/env changes: None
• Deployment notes: Safe to deploy anytime.

Checklist

• Changelog entry added
• Tests added/updated (not applicable — no testable behavior changed)
• External docs updated (regenerated via docs-generate)
• Internal .md docs updated (not applicable)

---

Summary by cubic

Fix truncated help text for infrahubctl schema load and check by adding explicit short_help, so the CLI and generated docs show complete sentences. Regenerated schema docs; no behavior changes.

^{Written for commit 402c255. Summary will update on new commits.}

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View logs

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@            Coverage Diff             @@
##           stable    #1240      +/-   ##
==========================================
- Coverage   83.37%   82.54%   -0.84%     
==========================================
  Files         141      138       -3     
  Lines       13577    12186    -1391     
  Branches     2195     1833     -362     
==========================================
- Hits        11320    10059    -1261     
+ Misses       1642     1568      -74     
+ Partials      615      559      -56     

Flag	Coverage Δ
integration-tests	40.56% <100.00%> (-0.19%)	⬇️
python-3.10	56.32% <100.00%> (-2.12%)	⬇️
python-3.11	56.32% <100.00%> (-2.12%)	⬇️
python-3.12	56.32% <100.00%> (-2.12%)	⬇️
python-3.13	56.32% <100.00%> (-2.12%)	⬇️
python-3.14	56.34% <100.00%> (-2.09%)	⬇️
python-filler-3.12	22.27% <0.00%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
infrahub_sdk/ctl/schema.py	62.82% <100.00%> (-12.75%)	⬇️

... and 8 files with indirect coverage changes

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[cubic-dev-ai]

No issues found across 3 files

_{Re-trigger cubic}