Implement the intent core

Details (original message):
Implement the intent core, conformance suite, catalog alignment, examples, and the intentctl diagnostics CLI.

intent/testdata/corpus.json

@@ -0,0 +1,14 @@
+{
+  "cases": [
+    {"name": "status_with_slot", "input": "查询任务 42 的进度", "expect_branch": "matched", "expect_top": "demo.run.status_query", "expect_slots": {"run_id": "42"}},
+    {"name": "status_term_only", "input": "帮我看下进度", "expect_branch": "matched", "expect_top": "demo.run.status_query"},
+    {"name": "guard_config_query", "input": "查询系统配置", "expect_branch": "guard_hit", "expect_top": "guard.config_change"},
+    {"name": "negated_write_readonly", "input": "怎么配置查询进度", "expect_branch": "fallback"},
+    {"name": "restart_task", "input": "把任务重启一下", "expect_branch": "matched", "expect_top": "demo.run.restart"},
+    {"name": "greet_ambiguous", "input": "你好呀", "expect_branch": "ambiguous"},
+    {"name": "cancel_missing_required_slot", "input": "取消一下", "expect_branch": "matched", "expect_top": "demo.run.cancel", "expect_missing_slots": ["run_id"]},
+    {"name": "case_fold_deploy", "input": "please DEPLOY it", "expect_branch": "matched", "expect_top": "demo.misc.deploy"},
+    {"name": "casual_fallback", "input": "今天天气不错", "expect_branch": "fallback"},
+    {"name": "blank_fallback", "input": "   ", "expect_branch": "fallback"}
+  ]
+}

intent/testdata/specs/base.json

@@ -0,0 +1,65 @@
+{
+  "intents": [
+    {
+      "id": "demo.run.status_query",
+      "domain": "demo",
+      "version": 1,
+      "description": "查询任务运行进度",
+      "matcher": {
+        "includes_any": ["进度", "状态"],
+        "excludes_any": ["配置"]
+      },
+      "slots": [
+        {"key": "run_id", "required": false, "pattern": "(?:run|任务)[:# ]*([A-Za-z0-9-]+)", "group": 1}
+      ],
+      "confidence": {"base": 0.8, "threshold": 0.7},
+      "risk": "low",
+      "handler": "taskrun.query_status",
+      "metadata": {"channel": "dialogue"}
+    },
+    {
+      "id": "demo.run.restart",
+      "domain": "demo",
+      "version": 1,
+      "description": "重启任务",
+      "matcher": {"includes_any": ["重启"], "includes_all": ["任务"]},
+      "confidence": {"base": 0.75, "threshold": 0.7},
+      "risk": "medium",
+      "requires_confirm": true,
+      "handler": "taskrun.restart"
+    },
+    {
+      "id": "demo.run.cancel",
+      "domain": "demo",
+      "version": 1,
+      "description": "取消任务",
+      "matcher": {"includes_any": ["取消"]},
+      "slots": [
+        {"key": "run_id", "required": true, "pattern": "(?:run|任务)[:# ]*([A-Za-z0-9-]+)", "group": 1}
+      ],
+      "handler": "taskrun.cancel"
+    },
+    {
+      "id": "demo.greet.hello",
+      "domain": "demo",
+      "version": 1,
+      "matcher": {"includes_any": ["你好"]},
+      "priority": 10
+    },
+    {
+      "id": "demo.greet.hi",
+      "domain": "demo",
+      "version": 1,
+      "matcher": {"includes_any": ["你好"]},
+      "priority": 5
+    },
+    {
+      "id": "demo.misc.deploy",
+      "domain": "demo",
+      "version": 1,
+      "matcher": {"includes_any": ["deploy", "发布"], "case_sensitive": false},
+      "handler": "deploy.run"
+    }
+  ],
+  "disable": []
+}