docs(13-01): complete interface info collector plan

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.planning/phases/13-link-discovery-registration-ingestion/13-01-SUMMARY.md

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+---
+phase: 13-link-discovery-registration-ingestion
+plan: 01
+subsystem: poller
+tags: [routeros, nats, interfaces, mac-address, link-discovery, go]
+
+requires:
+  - phase: 12-wireless-registration-collection
+    provides: "NATS publisher pattern, WIRELESS_REGISTRATIONS stream, withTimeout wrapper"
+provides:
+  - "InterfaceInfo struct with name, MAC, type, running fields"
+  - "CollectInterfaceInfo function for RouterOS /interface/print"
+  - "DeviceInterfaceEvent NATS publisher on device.interfaces.{device_id}"
+  - "DEVICE_EVENTS stream includes device.interfaces.> subject"
+affects: [13-link-discovery-registration-ingestion, link-state-machine, topology-map]
+
+tech-stack:
+  added: []
+  patterns: [interface-identity-collector, mac-normalization]
+
+key-files:
+  created:
+    - poller/internal/device/interfaces.go
+    - poller/internal/device/interfaces_test.go
+  modified:
+    - poller/internal/bus/publisher.go
+    - poller/internal/poller/worker.go
+
+key-decisions:
+  - "MAC addresses lowercased at collection time for consistent downstream matching"
+  - "Entries without mac-address skipped (loopback, bridge without MAC)"
+  - "Interface info collected separately from traffic counters (InterfaceInfo vs InterfaceStats)"
+
+patterns-established:
+  - "MAC normalization: all MAC addresses lowercased at the collection layer before publishing"
+  - "InterfaceInfo vs InterfaceStats: identity data (link discovery) separate from traffic counters (metrics)"
+
+requirements-completed: [LINK-01]
+
+duration: 5min
+completed: 2026-03-19
+---
+
+# Phase 13 Plan 01: Interface Info Collector Summary
+
+**Go poller InterfaceInfo collector publishing MAC addresses to DEVICE_EVENTS NATS stream for link discovery**
+
+## Performance
+
+- **Duration:** 5 min
+- **Started:** 2026-03-19T11:00:38Z
+- **Completed:** 2026-03-19T11:06:20Z
+- **Tasks:** 2
+- **Files modified:** 4
+
+## Accomplishments
+- InterfaceInfo struct and CollectInterfaceInfo function collect name, MAC, type, running from /interface/print
+- MAC addresses lowercased at collection time for consistent downstream link resolution
+- DeviceInterfaceEvent publisher sends to device.interfaces.{device_id} on DEVICE_EVENTS stream
+- Wired into PollDevice cycle after traffic counters, before health metrics
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Create interface info collector with v6/v7 routing** - `4b5bb94` (test) + `6939584` (feat)
+2. **Task 2: Add DeviceInterfaceEvent publisher, update DEVICE_EVENTS stream, wire into PollDevice** - `397a33a` (feat)
+
+_Note: Task 1 used TDD with separate test and implementation commits_
+
+## Files Created/Modified
+- `poller/internal/device/interfaces.go` - InterfaceInfo struct, CollectInterfaceInfo function, MAC normalization (added alongside existing InterfaceStats)
+- `poller/internal/device/interfaces_test.go` - Unit tests for struct fields, MAC lowercasing, running bool parsing
+- `poller/internal/bus/publisher.go` - DeviceInterfaceEvent type, PublishDeviceInterfaces method, device.interfaces.> added to DEVICE_EVENTS stream
+- `poller/internal/poller/worker.go` - Interface info collection wired into PollDevice after traffic counters
+
+## Decisions Made
+- MAC addresses lowercased at collection time (strings.ToLower) so downstream consumers never need to normalize
+- Entries without mac-address are silently skipped (loopback, bridge without MAC are not useful for link discovery)
+- InterfaceInfo is a separate type from InterfaceStats -- identity data for link discovery vs traffic counters for metrics
+- Collection placed after traffic counters, before health metrics in PollDevice to group interface-related work
+
+## Deviations from Plan
+
+### Auto-fixed Issues
+
+**1. [Rule 3 - Blocking] Restored InterfaceStats collector overwritten during file creation**
+- **Found during:** Task 1
+- **Issue:** Creating interfaces.go overwrote the pre-existing InterfaceStats type and CollectInterfaces function that publisher.go and worker.go depend on
+- **Fix:** Restored InterfaceStats and CollectInterfaces, appended new InterfaceInfo types below
+- **Files modified:** poller/internal/device/interfaces.go
+- **Verification:** go build ./... succeeds
+- **Committed in:** 6939584 (Task 1 commit)
+
+---
+
+**Total deviations:** 1 auto-fixed (1 blocking)
+**Impact on plan:** File creation overwrote existing code; restored immediately. No scope creep.
+
+## Issues Encountered
+None beyond the deviation noted above.
+
+## User Setup Required
+None - no external service configuration required.
+
+## Next Phase Readiness
+- Interface MAC data now published to NATS on every poll cycle
+- Backend subscriber (Plan 03) can consume device.interfaces.> to populate device_interfaces table
+- Link discovery (Plan 02) can match registration MACs against interface MACs for topology resolution
+
+## Self-Check: PASSED
+
+All 4 files verified present. All 3 commits verified in git log.
+
+---
+*Phase: 13-link-discovery-registration-ingestion*
+*Completed: 2026-03-19*