Context-efficient subagent routing for HappyCodex.
- Reuses stable subagent bodies for decision-changing deltas and uses fresh no-history children for independent evidence bodies.
- Adds compact auditable handoffs, Root seam correlation, and reason-gated rereads.
- Keeps small bounded work direct and makes compact ExecPlan reread conditional while preserving unconditional live-state re-grounding.
- Preserves v1.3.0 authority, freeze, secret-exclusion, Exact-final, and one-shot effect semantics.
- Reduces installed Skill tokens by about 7.5% on the measured tokenizer while avoiding hard quotas or truncation.
Validated with 106 offline tests, Skill and plugin validators, blind forward tests, and a fresh blocker-only Exact-final GO for 5e1386a.