Abstimmung: mehrere Agenten pruefen unabhaengig und stimmen blind ab (#702)

A unit can put operations to a blind vote instead of its lead. Not opinions
are counted but independent checks enforced.

- UnitConfig.votes: operations, voters, approveAt, rejectAt, quorum, hours,
  perDay - set only by a human (OrgAdministration.SetVotes).
- Core/Staging/Votes: routes a covered staged call before the lead; one task
  per voter with the frozen call and nothing else; cast_vote needs reasoning
  and evidence. Counted as soon as the result is settled; in between and
  without the quorum a human decides. The proposer does not vote, voters that
  read foreign content get no ballot, changes to agents never go to a vote.
- Escalation tool: list_ballots, cast_vote.
- Approvals view shows each vote with every ballot and the voters' costs;
  organisation view sets the rule and lists the votes held.

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

src/ClawdDotNet.Core/Storage/SqliteStorage.cs

@@ -342,6 +342,37 @@ public sealed class SqliteStorage
                 TaskId     TEXT NULL
             );
 
+            -- #702: blind votes on staged calls, one ballot per voter with reasoning, evidence and run.
+            CREATE TABLE IF NOT EXISTS Votes (
+                Id        INTEGER PRIMARY KEY AUTOINCREMENT,
+                CallId    INTEGER NOT NULL,
+                UnitId    TEXT    NOT NULL,
+                Proposer  TEXT    NOT NULL,
+                Operation TEXT    NOT NULL,
+                ApproveAt INTEGER NOT NULL,
+                RejectAt  INTEGER NOT NULL,
+                Quorum    INTEGER NOT NULL,
+                Until     TEXT    NOT NULL,
+                CreatedAt TEXT    NOT NULL,
+                Outcome   TEXT    NULL,
+                DecidedAt TEXT    NULL
+            );
+
+            CREATE INDEX IF NOT EXISTS IX_Votes_Call ON Votes (CallId);
+            CREATE INDEX IF NOT EXISTS IX_Votes_Open ON Votes (Outcome);
+
+            CREATE TABLE IF NOT EXISTS VoteBallots (
+                VoteId    INTEGER NOT NULL,
+                Voter     TEXT    NOT NULL,
+                TaskId    TEXT    NULL,
+                Yes       INTEGER NULL,
+                Reasoning TEXT    NOT NULL DEFAULT '',
+                Evidence  TEXT    NOT NULL DEFAULT '',
+                RunId     TEXT    NULL,
+                CastAt    TEXT    NULL,
+                PRIMARY KEY (VoteId, Voter)
+            );
+
             CREATE TABLE IF NOT EXISTS StagedCalls (
                 Id              INTEGER PRIMARY KEY AUTOINCREMENT,
                 RunId           TEXT    NOT NULL,