[log] Add debug logging to difc/path_labels.go

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Summary

Adds a logPathLabels debug logger to internal/difc/path_labels.go following the project's pkg:filename naming convention already established across the difc package (logCapabilities, logLabels, logAgent, logEvaluator).

Changes

File modified: internal/difc/path_labels.go

Logger added:

var logPathLabels = logger.New("difc:path_labels")

6 logging calls added:

Location	Log message
NewPathLabeledData	Logs MCP wrap detection status and number of labeled paths
unwrapMCPResponse	Logs when an MCP-wrapped response is detected and unwrapped
resolve (nil items)	Logs when data is treated as a single item (no collection)
resolve (collection)	Logs item count and number of explicitly labeled paths
ParsePathLabels (entry)	Logs input byte count
ParsePathLabels (exit)	Logs number of parsed labeled paths and whether default labels exist

Why This File

path_labels.go handles complex JSON path resolution and MCP response unwrapping logic that is critical to DIFC filtering — yet it was the only file in the difc package without a logger. Adding logging here enables developers to trace:

• Whether MCP response unwrapping is occurring
• How many items are being resolved against path labels
• Parse results from guard responses

Activation

DEBUG=difc:path_labels ./awmg --config config.toml
# or
DEBUG=difc:* ./awmg --config config.toml

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