docs: add long-horizon reliability fixes learning + scrub CONCEPTS.md
- New solution doc: logic-errors/long-horizon-reliability-code-review-fixes.md
Documents 13 code-review fixes (2 P0, 5 P1, 6 P2) across U1-U7
long-horizon reliability features (disclosure_level default, resume
plan_id mismatch, middleware dataclass compat, state offload readback,
checkpoint dedup, dynamic phase persistence, debate count restore,
loop detection reset, concurrent resume lock, FAILED phase handling,
checkpoint cleanup, offload type guard).
- CONCEPTS.md: add Expert Orchestration cluster (Disclosure Level,
State Offloading, Pipeline Checkpoint, Debate Phase, Resume).
Scrub Bitable entries to remove implementation specifics per
vocabulary rules (API paths, library calls, SQL syntax, class names,
enum values).
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