Add browser dashboard, run tracing, and logged navigation decisions

- dashboard.py: stdlib http.server + JSON API (tree/trace/dream/status,
  POST submit/relabel); static/ single-page Redux-DevTools-style inspector
- trace.py: runs.jsonl lifecycle events keyed by run_id
- scheduler/skills/skill: every decision carries run_id; navigation choices
  now logged (navigate:category/leaf); requeues stamp meta.parent_run
- cli: 'dashboard' subcommand; config.json untracked per-machine (see
  config.example.json)

config.example.json

@@ -0,0 +1,24 @@
+{
+  "_comment": "Per-machine config. config.json is gitignored; copy this file to config.json and adjust paths. The box (guppy) keeps its own config.json with local paths.",
+  "tau": 0.6,
+  "max_reentries": 3,
+  "queue": {"max_size": 100, "age_rate": 0.01},
+  "engine": {
+    "backend": "llamacpp",
+    "source": "Qwen/Qwen3.5-4B",
+    "revision": "851bf6e806efd8d0a36b00ddf55e13ccb7b8cd0a",
+    "gguf": "/home/abby/models/Qwen3.5-4B-Q4_K_M.gguf",
+    "context_tokens": 4096,
+    "threads": 8
+  },
+  "llm": {"base_url": "http://localhost:11434/v1", "model": "qwen3.5:4b"},
+  "skills": {
+    "email": {"cost_budget": 1.0},
+    "contacts": "data/contacts.json",
+    "drafts": "data/drafts",
+    "packages": "data/packages.json"
+  },
+  "log": "data/decisions.jsonl",
+  "trace": "data/runs.jsonl",
+  "dashboard": {"port": 8765}
+}