fix: add FilteredItemLogEntry type and buildFilteredItemLogEntry to fix lint failure

[Copilot]

CI lint failed with undefined: FilteredItemLogEntry because difc_log_test.go referenced two symbols that didn't exist in production code: FilteredItemLogEntry (struct) and buildFilteredItemLogEntry (func). The production code had a mismatched buildFilteredLogEntry returning *logger.JSONLFilteredItem with no text-log output.

Changes to internal/server/difc_log.go

• New FilteredItemLogEntry struct — local type with JSON tags matching what the tests deserialize; decoupled from logger.JSONLFilteredItem
• Renamed buildFilteredLogEntry → buildFilteredItemLogEntry — returns FilteredItemLogEntry value (not pointer), matching test call sites
• Updated logFilteredItems — marshals entry to JSON and writes [DIFC-FILTERED] <json> to both unified and per-server text logs via LogInfoWithServer; continues emitting to JSONL via LogDifcFilteredItem for backward compatibility
• Added toJSONLFilteredItem() method — converts FilteredItemLogEntry → *logger.JSONLFilteredItem to eliminate duplicated field mapping
• Improved error handling — logs marshal failures via LogInfoWithServer instead of silently dropping them

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• example.com
  • Triggering command: /tmp/go-build2821814806/b332/launcher.test /tmp/go-build2821814806/b332/launcher.test -test.testlogfile=/tmp/go-build2821814806/b332/testlog.txt -test.paniconexit0 -test.timeout=10m0s /tmp/go-build2821814806/b237/vet.cfg 1.4.0/mcp/client.go 1.4.0/mcp/cmd.go x_amd64/compile (dns block)
• invalid-host-that-does-not-exist-12345.com
  • Triggering command: /tmp/go-build2821814806/b317/config.test /tmp/go-build2821814806/b317/config.test -test.testlogfile=/tmp/go-build2821814806/b317/testlog.txt -test.paniconexit0 -test.timeout=10m0s main�� mat.go se.go x_amd64/compile --detach contextprotocol/-unsafeptr=false (dns block)
• nonexistent.local
  • Triggering command: /tmp/go-build2821814806/b332/launcher.test /tmp/go-build2821814806/b332/launcher.test -test.testlogfile=/tmp/go-build2821814806/b332/testlog.txt -test.paniconexit0 -test.timeout=10m0s /tmp/go-build2821814806/b237/vet.cfg 1.4.0/mcp/client.go 1.4.0/mcp/cmd.go x_amd64/compile (dns block)
• slow.example.com
  • Triggering command: /tmp/go-build2821814806/b332/launcher.test /tmp/go-build2821814806/b332/launcher.test -test.testlogfile=/tmp/go-build2821814806/b332/testlog.txt -test.paniconexit0 -test.timeout=10m0s /tmp/go-build2821814806/b237/vet.cfg 1.4.0/mcp/client.go 1.4.0/mcp/cmd.go x_amd64/compile (dns block)
• this-host-does-not-exist-12345.com
  • Triggering command: /tmp/go-build2821814806/b341/mcp.test /tmp/go-build2821814806/b341/mcp.test -test.testlogfile=/tmp/go-build2821814806/b341/testlog.txt -test.paniconexit0 -test.timeout=10m0s /tmp/go-build2821814806/b253/vet.cfg _.a ternal/fips140/hkdf/cast.go 522601/b097=> (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Fix the failing GitHub Actions workflow lint
Analyze the workflow logs, identify the root cause of the failure, and implement a fix.
Job ID: 67501871628
Job URL: https://github.com/github/gh-aw-mcpg/actions/runs/23223729138/job/67501871628

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[Copilot]

Pull request overview

This PR fixes a CI lint/test compilation failure by adding the missing DIFC filtered-item logging symbols that were referenced by difc_log_test.go, and aligns production logging behavior with what the tests expect.

Changes:

• Introduces FilteredItemLogEntry (a local struct with JSON tags matching test deserialization).
• Renames/defines buildFilteredItemLogEntry to build the new struct (and adds a conversion helper to JSONL format).
• Updates logFilteredItems to emit [DIFC-FILTERED] <json> to both unified and per-server text logs while preserving JSONL emission.

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