v2.8.0 — Redis-backed manifest for parallel ingest

BREAKING: Redis required for parallel ingest operations.

Features:
- Redis-backed manifest operations (manifest-redis.sh)
- Atomic LPUSH operations, no race conditions
- Network-based, works regardless of subagent sandbox

Requirements:
- Redis server accessible
- redis-cli installed
- HAZE_REDIS_HOST / HAZE_REDIS_PORT (default: 127.0.0.1:6379)

New commands:
- /haze redis status
- /haze redis sync
- /haze redis clear

Key fix: Subagent prompt template now included in command spec.
Without it, subagents wrote summaries but never updated manifest.

Changelog:
- v2.7.9: flock-based manifest locking (hook-level only)
- v2.7.10: manifest fragments (filesystem-dependent)
- v2.8.0: Redis (network-based, bulletproof)