fix(signals): dedupe reward-risk next-actions before capping

[galuis116]

Closes #463.

buildRepoRewardRisk (line 274) and buildContributorRewardRiskStrategy (line 372) applied .slice(0, N) inside new Set(...), truncating the flattened next-actions before deduping. When the first N entries contain duplicates — common in the cross-repo aggregate, since nextActionsFor(kind) returns the same string for a given action kind regardless of repo — the deduped result collapses below the cap and distinct lower-priority steps (e.g. file_issue_discovery, maintainer_lane) are silently dropped.

Change

Move the cap outside the Set so the list is deduped first, then capped — matching the rest of the codebase, including the identical flatMap-nextActions pattern in src/services/decision-pack.ts:619 and the dedupe-then-slice convention in queue/processors.ts, agent-orchestrator.ts, local-branch.ts, etc.

-const nextActions = [...new Set(actions.flatMap((a) => a.nextActions).slice(0, 8))];
+const nextActions = [...new Set(actions.flatMap((a) => a.nextActions))].slice(0, 8);
-const nextActions = [...new Set(topActions.flatMap((a) => a.nextActions).slice(0, 10))];
+const nextActions = [...new Set(topActions.flatMap((a) => a.nextActions))].slice(0, 10);

Verification

• Pure behavior-preserving reorder; both lines stay exercised by the existing buildRepoRewardRisk / buildContributorRewardRiskStrategy tests in signals-v2.test.ts. Full unit suite green (1254 passed). The observable regression only surfaces with many same-kind repos, which the current fixtures don't construct.

[ghost]

Note

Gittensory Gate skipped

PR closed before full evaluation. No late first comment was created.

Signal	Result	Evidence	Action
Gate result	⚠️ Skipped	#464 is no longer open.	No action.

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[JSONbored]

@galuis116 this is ready.

A few notes:

• Dedupe now happens before the cap, so duplicate early entries no longer crowd out distinct next actions.
• The change matches the existing convention used elsewhere in the codebase.
• No code changes requested.