Automatisierungsvorschlaege: Agenten schlagen n8n-Workflows vor, der Mensch importiert von Hand (#726)

- Core/Automation/WorkflowReview: free check of an n8n export - every node
  with its effect and target, code/command/SSH nodes only with a stated
  reason, embedded secrets refused (by name or by look), a short summary of
  what the workflow does.
- AutomationProposals: measured saving from the replaced tasks' receipts
  (28 days), at most 3 open per agent, the same purpose not twice, a
  rejected proposal must be answered; the human gets a task and decides in
  the approvals view. Accepting records it - importing stays a human's step.
- Candidates: recurring tasks whose runs repeat the same calls (>= 75 % of
  >= 8 runs in 14 days) are put to their agent once a month.
- Escalation tool: automation_find, automation_propose.
- Approvals view: proposals with nodes, targets, warnings, saving, JSON
  download, accept/reject.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/ClawdDotNet.Core/Storage/SqliteStorage.cs

@@ -395,6 +395,36 @@ public sealed class SqliteStorage
 
             CREATE INDEX IF NOT EXISTS IX_InboundTriggerEvents_Trigger ON InboundTriggerEvents (TriggerId, ReceivedAt);
 
+            -- #726: workflows agents propose, the human decides; and the tasks already put to their agent.
+            CREATE TABLE IF NOT EXISTS AutomationProposals (
+                Id            INTEGER PRIMARY KEY AUTOINCREMENT,
+                AgentId       TEXT NOT NULL,
+                Purpose       TEXT NOT NULL,
+                Trigger       TEXT NOT NULL,
+                TaskIds       TEXT NOT NULL,
+                Services      TEXT NOT NULL,
+                Risks         TEXT NOT NULL,
+                TestGuide     TEXT NOT NULL,
+                WorkflowJson  TEXT NOT NULL,
+                Justification TEXT NULL,
+                Summary       TEXT NOT NULL,
+                Nodes         TEXT NOT NULL,
+                Warnings      TEXT NOT NULL,
+                Savings       TEXT NOT NULL,
+                Status        TEXT NOT NULL,
+                Reason        TEXT NULL,
+                CreatedAt     TEXT NOT NULL,
+                DecidedAt     TEXT NULL,
+                TaskId        TEXT NULL,
+                Answers       INTEGER NULL,
+                Argument      TEXT NULL
+            );
+
+            CREATE TABLE IF NOT EXISTS AutomationCandidates (
+                TaskId  TEXT NOT NULL,
+                NotedAt TEXT NOT NULL
+            );
+
             CREATE TABLE IF NOT EXISTS StagedCalls (
                 Id              INTEGER PRIMARY KEY AUTOINCREMENT,
                 RunId           TEXT    NOT NULL,