Phase 1.1: integrate real Anthropic Dreams API

[jim4226]

The current csis/dreams/ module is a local mock of the consolidation pipeline. Phase 1.1 replaces it with the real Anthropic Dreams API once available to the operator.

What needs to exist

• A new csis/dreams/anthropic_dreams.py that implements the same interface as the local mock
• Selection logic in the daemon: --dreams anthropic vs --dreams mock
• Budget tracking integration — real Dreams calls bill the same BudgetTracker (cycle-9 H1 chokepoint discipline carries over)
• Partial-output redaction: real Dreams returns partial output on cancel/failure; cycle-1 F-class findings put this front-and-center

Acceptance criteria

• New adapter module
• Plumbed into csis/daemon.py
• Regression test (probably skipped without API key, like tests/test_anthropic_backend.py)
• Updated README documenting the trade-offs (mock is free + offline + deterministic; real Dreams adds cost + non-determinism + actual consolidation)

Risks

• Real Dreams may have different latency characteristics than the local mock — may force budget tracker reservation defaults to be re-tuned
• Partial-output semantics may have changed since the cycle-4 critique was written; re-validate

Tracking

See ROADMAP.md P1.1.