feat(cli): add threshold flag override

[rodboev]

Change Description

Adds a top-level --threshold flag to presidio-cli, so one-shot invocations can set the analyzer confidence threshold without writing a YAML config file or passing inline YAML through -d.

The CLI flag overrides threshold values loaded from -c, -d, .presidiocli, or the default config for the current invocation only. Existing config-file behavior and the default threshold remain unchanged when the flag is omitted.

This also updates the CLI README with plain --threshold usage and precedence notes, and records the feature in the root changelog under a new Presidio CLI unreleased section.

Issue reference

Fixes #2101

Tests

• poetry run pytest tests/test_cli.py
• poetry run ruff check presidio_cli tests

Note on CHANGELOG

Update CHANGELOG.md under [unreleased] → Presidio CLI → Added.

Checklist

• I have reviewed the contribution guidelines
• I have signed the CLA (if required)
• My code includes unit tests
• All unit tests and lint checks pass locally
• My PR contains documentation updates / additions if required

[rodboev]

@microsoft-github-policy-service agree

[Copilot]

Pull request overview

Adds a --threshold command-line flag to presidio-cli so users can override the configured analyzer confidence threshold for a single invocation without modifying or providing YAML configuration.

Changes:

• Added --threshold CLI argument with validation (0.0–1.0) and applied it as an in-memory override after config loading.
• Expanded CLI unit tests to cover threshold override behavior and threshold parsing errors.
• Updated CLI documentation and the root changelog to document the new flag and its precedence.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
presidio-cli/presidio_cli/cli.py	Adds --threshold flag parsing/validation and applies the override to the loaded config.
presidio-cli/tests/test_cli.py	Adds tests for threshold override behavior and threshold parsing validation.
presidio-cli/README.md	Documents the threshold config key and the new --threshold override behavior/precedence.
CHANGELOG.md	Notes the new CLI flag under the unreleased Presidio CLI section.