REC-F06: Separate selection from gameplay success

[mattebad]

Scope

REC-F06: separate descriptive scheduler selection from gameplay success.

• World, Nova, Recruitment, Campaign, and disabled handlers return the sole non-consuming SelectionPlan contract.
• Explicit selector paths never claim or terminalize an occurrence; arbitrary real-runner planning remains behind RUNNING/dispatch fences.
• Zero-input completion requires exact verified=True, ALREADY_COMPLETE, and an explicitly permitting matching handler FlowSpec.
• Migrate CLI and scheduler consumers to selected-candidate/result-null behavior; preserve ordinary versus milestone action identities and AP eligibility.

Verification

• Independent full reviewer: ACCEPT, all five acceptance criteria.
• 76 focused and caller tests passed.
• Selected offline check: 310 tests passed; directly affected suite: 117 passed; compileall passed.
• Actual CLI smoke used temporary SQLite: two eligible pulses selected the same occurrence with result null, zero runs/actions, and zero transport.
• Committed whitespace check passed. Windows/Linux CI required before merge.

Offline only: no native/device calls, production enablement, registration/policy promotion, or retained-evidence changes. Live registry consumption/caller cutovers remain held for F09/F13.