docs: plan both telemetry changes down to the task level

Twelve tasks across the two plans, each with the files it touches, the
evidence it has to produce, and the command that proves it. #13 goes
first: both branches edit config.py and client.py, and #12's
partitioning template leans on the schema SQL helper and the untargeted
conflict clause that #13 introduces.

Writing the cap plan surfaced a trap worth its own guard. digest_messages
appends the very same dict when a message's content is not a list, so
the telemetry copy, the caller's messages and the cache key all share
one object -- capping in place would poison the caller's request and the
cache key at once, silently. Two red-line tests now pin that down, and
the plan asks for an in-place version to be written and run first, to
prove the tests actually catch it.

research-wiki/graph/edges.json

@@ -175,6 +175,16 @@
       "id": "design:issue12-telemetry-retention",
       "label": "issue #12: 遥测表的正文体量、保留期与访问控制",
       "type": "design"
+    },
+    {
+      "id": "plan:plan-issue13-schema-mode",
+      "label": "实现计划: issue13-schema-mode",
+      "type": "plan"
+    },
+    {
+      "id": "plan:plan-issue12-telemetry-retention",
+      "label": "实现计划: issue12-telemetry-retention",
+      "type": "plan"
     }
   ],
   "links": [
@@ -310,6 +320,20 @@
       "relation": "implements",
       "evidence": "按已批准设计拆解为 8 个任务,含设计范围外发现的 OCR 第三条链路",
       "added": "2026-08-17T10:09:08.967997+00:00"
+    },
+    {
+      "source": "plan:plan-issue13-schema-mode",
+      "target": "design:issue13-schema-mode",
+      "relation": "implements",
+      "evidence": "research-wiki/plans/2026-08-19-issue13-schema-mode.md",
+      "added": "2026-08-19T13:10:55.616264+00:00"
+    },
+    {
+      "source": "plan:plan-issue12-telemetry-retention",
+      "target": "design:issue12-telemetry-retention",
+      "relation": "implements",
+      "evidence": "research-wiki/plans/2026-08-19-issue12-telemetry-retention.md",
+      "added": "2026-08-19T13:10:57.986963+00:00"
     }
   ]
 }