[Roman Lutz (romanlutz)]

Description

Make two private helpers follow PyRIT's keyword-only convention without changing truncation or metadata-filter behavior. This is the small cleanup identified during #3960.

• Require max_length= in _truncate_text and key= in _get_metadata_value, updating every caller.
• Add focused regression coverage for parameter kinds, truncation boundaries, attribute precedence, and parameter-based filters.
• Remove only these two helpers from the legacy baseline introduced in MAINT: Add static keyword-only parameter check with baseline #3960.

Public APIs are unchanged.

[Copilot]

🟢 Approval recommended

No active review issues were identified for the private-helper keyword-only migration.

No open issues 🎉

What changed in this PR

This PR migrates two private helpers to PyRIT’s keyword-only convention, following up on #3960 without changing public APIs or helper behavior.

Changes:

• Require max_length= and key= in the helpers and update their callers.
• Add regression tests for keyword-only parameters, truncation boundaries, and metadata filtering.
• Remove the two migrated helpers from the legacy baseline.

File	Description
tests/​unit/​registry/​test_registry.py	Tests keyword-only enforcement, attribute precedence, and parameter-based filters.
tests/​unit/​cli/​test_output.py	Tests truncation boundaries and keyword-only enforcement.
pyrit/​registry/​registry.py	Makes key keyword-only and updates filter callers.
pyrit/​cli/​_output.py	Makes max_length keyword-only and updates output callers.
build_scripts/​keyword_only_baseline.txt	Removes the two migrated helper entries.

_{Review effort: Balanced}