feat: Add APPMAP_DISPLAY_LABELED_PARAMS to capture params for labeled functions

[kgilpin]

Adds a new env var APPMAP_DISPLAY_LABELED_PARAMS (default: true) that enables str and repr()-based parameter and return value capture for functions that have labels, even when APPMAP_DISPLAY_PARAMS is off. This provides useful parameter visibility for semantically important functions (HTTP, crypto, serialization, etc.) without the performance cost of capturing all parameters globally.

[Copilot]

Pull request overview

Adds a new configuration knob to selectively capture parameter/return-value details (via repr() and schema) for labeled functions even when global parameter capture is disabled, improving visibility for semantically important calls without enabling full parameter capture everywhere.

Changes:

• Introduces APPMAP_DISPLAY_LABELED_PARAMS (default true) and threads it through initialization and Env.
• Propagates “has labels” metadata through instrumentation so event value rendering can decide whether to display details.
• Adds tests and test fixtures validating labeled vs unlabeled behavior under different env settings.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
appmap/__init__.py	Initializes _APPMAP_DISPLAY_LABELED_PARAMS from APPMAP_DISPLAY_LABELED_PARAMS (default true) when AppMap is enabled.
_appmap/env.py	Adds display_labeled_params to Env for runtime checks.
_appmap/event.py	Adds _should_display(has_labels) gating and plumbs has_labels into parameter/return value description logic.
_appmap/instrument.py	Detects whether the function has labels and forwards has_labels into param/return event creation.
_appmap/test/conftest.py	Ensures tests initialize _APPMAP_DISPLAY_LABELED_PARAMS for deterministic behavior.
_appmap/test/test_events.py	Adds coverage for labeled/unlabeled param/return display behavior under env combinations.
_appmap/test/data/example_class.py	Adds a labeled method that takes a parameter for exercising the new behavior in tests.

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