[log] Add debug logger to config feature registration framework

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Summary

Adds a debug logger (logFeature) to internal/config/config_feature.go, which implements the modular feature registration framework for configuration loading.

Changes

File modified: internal/config/config_feature.go

Added logger.New("config:feature") and 6 logging calls:

• RegisterDefaults: logs when a new defaults setter is registered (with running count)
• RegisterStdinConverter: logs when a new stdin converter is registered (with running count)
• applyDefaults: logs before and after dispatching to all registered setters
• applyStdinConverters: logs before and after dispatching to all registered converters

Why this file?

This file is the central dispatch hub for modular config features. It had no debug logging at all, making it impossible to trace:

• Which features have registered their defaults/converters
• How many setters/converters are active at startup
• Whether defaults are being applied during config loading

With DEBUG=config:* enabled, developers can now see the full feature registration lifecycle.

Example debug output

config:feature Registered defaults setter: total=1
config:feature Registered stdin converter: total=1
config:feature Applying 1 default setter(s)
config:feature All default setters applied
config:feature Applying 1 stdin converter(s)
config:feature All stdin converters applied

Testing

• No test files modified
• Logger arguments have no side effects (only len() and literal strings used)
• Follows pkg:filename naming convention (config:feature)
• Reuses existing logger.New() pattern from config:validation, config:validation_env, config:validation_schema

AI generated by Go Logger Enhancement

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Pull request overview

This PR adds debug logging to the feature registration framework in internal/config/config_feature.go, enabling developers to trace which configuration features register themselves at startup and when their defaults/converters are applied during config loading.

Changes:

• Added logFeature debug logger with config:feature namespace
• Added registration logging to RegisterDefaults and RegisterStdinConverter (with running counts)
• Added before/after logging to applyDefaults and applyStdinConverters dispatcher functions

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