feat: add runtime context awareness — system.info tool + date/time in system prompt

- assembleSystemPrompt() now injects '# Runtime Context' with current date/time
- New system.info tool: date, time, hostname, platform, arch, uptime, memory, Node.js version
- Tool available in all profiles (minimal/messaging/coding/full)
- 983 tests passing (+7 new)

docs/plans/state.json

@@ -694,6 +694,37 @@
         }
       }
     },
+    "runtime-context-awareness": {
+      "status": "completed",
+      "date": "2026-02-07",
+      "summary": "Runtime context: system.info tool + automatic date/time injection in system prompt",
+      "phases": {
+        "system_prompt_date_injection": {
+          "status": "completed",
+          "description": "assembleSystemPrompt() now unconditionally appends a '# Runtime Context' section with current date and time",
+          "files_modified": [
+            "src/prompt/template.ts",
+            "src/prompt/template.test.ts"
+          ],
+          "test_status": "13/13 passing"
+        },
+        "system_info_tool": {
+          "status": "completed",
+          "description": "New system.info tool providing date, time, hostname, platform, architecture, OS release, uptime, Node.js version, memory usage, working directory. Added to all tool profiles (minimal/messaging/coding).",
+          "files_created": [
+            "src/tools/builtin/system-info.ts",
+            "src/tools/builtin/system-info.test.ts"
+          ],
+          "files_modified": [
+            "src/tools/builtin/index.ts",
+            "src/tools/policy.ts",
+            "src/tools/index.ts",
+            "SOUL.md"
+          ],
+          "test_status": "6/6 passing"
+        }
+      }
+    },
     "earlier_plans": {
       "plans": [
         { "file": "2026-02-02-flynn-design.md", "status": "completed" },
@@ -717,7 +748,7 @@
   },
 
   "overall_progress": {
-    "total_test_count": 976,
+    "total_test_count": 983,
     "all_tests_passing": true,
     "p0_completion": "3/3 (100%)",
     "p1_completion": "4/4 (100%)",
@@ -730,7 +761,7 @@
     "p8_completion": "8/8 (100%) — agent tools (sessions.list/history/create/delete, agents.list, message.send, cron.list/trigger) + gap analysis audit",
     "tier1_completion": "5/5 (100%) — !!think prefix, /verbose command, typing indicators (Discord/WhatsApp), session pruning (TTL), tool groups",
     "tier2_completion": "4/4 (100%) — inbound webhooks, vector memory search, Dockerfile, heartbeat monitor",
-    "feature_gap_scorecard": "87/116 match (75%), 1 partial (1%), 27 missing (23%)",
+    "feature_gap_scorecard": "88/116 match (76%), 1 partial (1%), 27 missing (23%)",
     "next_up": "All phases P0-P8 and Tiers 1-2 complete. Tier 3 in progress (file.patch + Gmail done). Remaining gaps: Tier 3 channels (Signal, Matrix, Teams, Google Chat), Tier 4 deferred/niche items"
   }
 }