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/Tools/AgentToolContext.cs

@@ -58,6 +58,9 @@ public sealed record AgentToolContext(
     /// <summary>#693: The spot checks of a lead. <c>null</c> outside the engine.</summary>
     public Inspection.ISpotChecks? SpotChecks { get; init; }
 
+    /// <summary>#702: The ballots of a voter. <c>null</c> outside the engine.</summary>
+    public Staging.IVotes? Votes { get; init; }
+
     /// <summary>#654: Where code runs — never in the main process. Unavailable under Windows.</summary>
     public Sandbox.ISandboxRunner? Sandbox { get; init; }