docs: update deprecated CLI flag references

[motodriver]

Summary

• replace user-facing --model_type and --model_name references with --target_type and --target_name
• replace deprecated probe-selection examples with --spec probes.* across the README and generator/translation docs
• add a regression test that scans user documentation for deprecated CLI flags while preserving intentional references in CLI and migration documentation

Related to #2131. A repository collaborator confirmed in the issue that stray references to the deprecated flags remained and could be updated.

Duplicate-work check

Before opening this PR, I searched open PRs for both 2131 in:body and deprecated CLI flags documentation. Neither search returned an existing PR addressing this work.

Verification

• env -u PYTHONHOME -u PYTHONPATH .venv/bin/pytest tests/test_docs.py -q — 683 passed
• From docs/source: env -u PYTHONHOME -u PYTHONPATH ../../.venv/bin/python -m sphinx -T -E -b html -d _build/doctrees -D language=en ./ html — build succeeded
• git diff --check origin/main...HEAD — passed
• Verified the changed examples use current target and spec syntax
• Verified intentional deprecated-flag references in cliref.rst and configurable.rst remain allowed

AI assistance and human review

AI assistance from TRAE was used for repository search, drafting the edits, and running verification. I reviewed every changed line, understand the change end-to-end, and can defend it. The commit includes both Assisted-by: TRAE and my DCO Signed-off-by trailer.