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## feat: path-prefix candidate inspector with map view (#944) Implements the locked spec from #944: a beam-search-based path prefix inspector that enumerates candidate full-pubkey paths from short hex prefixes and scores them. ### Server (`cmd/server/path_inspect.go`) - **`POST /api/paths/inspect`** — accepts 1-64 hex prefixes (1-3 bytes, uniform length per request) - Beam search (width 20) over cached `prefixMap` + `NeighborGraph` - Per-hop scoring: edge weight (35%), GPS plausibility (20%), recency (15%), prefix selectivity (30%) - Geometric mean aggregation with 0.05 floor per hop - Speculative threshold: score < 0.7 - Score cache: 30s TTL, keyed by (prefixes, observer, window) - Cold-start: synchronous NeighborGraph rebuild with 2s hard timeout → 503 `{retry:true}` - Body limit: 4096 bytes via `http.MaxBytesReader` - Zero SQL queries in handler hot path - Request validation: rejects empty, odd-length, >3 bytes, mixed lengths, >64 hops ### Frontend (`public/path-inspector.js`) - New page under Tools route with input field (comma/space separated hex prefixes) - Client-side validation with error feedback - Results table: rank, score (color-coded speculative), path names, per-hop evidence (collapsed) - "Show on Map" button calls `drawPacketRoute` (one path at a time, clears prior) - Deep link: `#/tools/path-inspector?prefixes=2c,a1,f4` ### Nav reorganization - `Traces` nav item renamed to `Tools` - Backward-compat: `#/traces/<hash>` redirects to `#/tools/trace/<hash>` - Tools sub-routing dispatches to traces or path-inspector ### Store changes - Added `LastSeen time.Time` to `nodeInfo` struct, populated from `nodes.last_seen` - Added `inspectMu` + `inspectCache` fields to `PacketStore` ### Tests - **Go unit tests** (`path_inspect_test.go`): scoreHop components, beam width cap, speculative flag, all validation error cases, valid request integration - **Frontend tests** (`test-path-inspector.js`): parse comma/space/mixed, validation (empty, odd, >3 bytes, mixed lengths, invalid hex, valid) - Anti-tautology gate verified: removing beam pruning fails width test; removing validation fails reject tests ### CSS - `--path-inspector-speculative` variable in both themes (amber, WCAG AA on both dark/light backgrounds) - All colors via CSS variables (no hardcoded hex in production code) Closes #944 --------- Co-authored-by: you <you@example.com>