refactor: relocate agent-system/ to .agents/ with 7-role workflow restructure

Moves the agent workflow system from agent-system/ to .agents/ (dotfile convention).
Restructured from 5-role to 7-role pipeline: adds Analyst and splits Reviewer into
Code Reviewer + Security Reviewer. Removes all old workflow run artifacts.

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

.agents/contracts/finalizer.schema.json

@@ -0,0 +1,98 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "title": "Finalizer Output",
+  "type": "object",
+  "required": [
+    "task_id",
+    "ready_to_finalize",
+    "code_review",
+    "security_review",
+    "acceptance_review",
+    "ci_status",
+    "final_action"
+  ],
+  "properties": {
+    "task_id": { "type": "string", "minLength": 1 },
+    "ready_to_finalize": { "type": "boolean" },
+    "code_review": { "type": "string", "enum": ["pass", "fail"] },
+    "security_review": { "type": "string", "enum": ["pass", "fail"] },
+    "acceptance_review": { "type": "string", "enum": ["pass", "fail"] },
+    "ci_status": { "type": "string", "enum": ["pass", "fail", "unknown"] },
+    "final_action": { "type": "string", "enum": ["commit", "merge", "hold"] },
+    "hold_reason": { "type": "string", "minLength": 1 },
+    "commit_message": { "type": "string" },
+    "notes": { "type": "string" }
+  },
+  "allOf": [
+    {
+      "if": {
+        "properties": { "final_action": { "const": "hold" } },
+        "required": ["final_action"]
+      },
+      "then": {
+        "required": ["hold_reason"]
+      }
+    },
+    {
+      "if": {
+        "properties": { "final_action": { "enum": ["commit", "merge"] } },
+        "required": ["final_action"]
+      },
+      "then": {
+        "properties": {
+          "ready_to_finalize": { "const": true },
+          "code_review": { "const": "pass" },
+          "security_review": { "const": "pass" },
+          "acceptance_review": { "const": "pass" },
+          "ci_status": { "const": "pass" }
+        }
+      }
+    },
+    {
+      "if": {
+        "properties": { "ci_status": { "enum": ["fail", "unknown"] } },
+        "required": ["ci_status"]
+      },
+      "then": {
+        "properties": { "final_action": { "const": "hold" } }
+      }
+    },
+    {
+      "if": {
+        "properties": { "code_review": { "const": "fail" } },
+        "required": ["code_review"]
+      },
+      "then": {
+        "properties": { "final_action": { "const": "hold" } }
+      }
+    },
+    {
+      "if": {
+        "properties": { "security_review": { "const": "fail" } },
+        "required": ["security_review"]
+      },
+      "then": {
+        "properties": { "final_action": { "const": "hold" } }
+      }
+    },
+    {
+      "if": {
+        "properties": { "acceptance_review": { "const": "fail" } },
+        "required": ["acceptance_review"]
+      },
+      "then": {
+        "properties": { "final_action": { "const": "hold" } }
+      }
+    },
+    {
+      "if": {
+        "properties": { "ready_to_finalize": { "const": false } },
+        "required": ["ready_to_finalize"]
+      },
+      "then": {
+        "properties": { "final_action": { "const": "hold" } }
+      }
+    }
+  ],
+  "additionalProperties": false
+}