Add heat-based automod with escalating punishments

[Copilot]

Implements a heat accumulation system for automod violations with configurable thresholds and escalating punishments. Users accumulate "heat" points for violations; reaching thresholds triggers progressively severe punishments (WARN → MUTE → KICK → BAN).

Implementation

• Heat tracking: Redis storage with TTL-based expiration. Heat decays after configurable inactivity period (default 1h). Timer resets on each violation to keep active violators hot.

• Database schema (migrations/0021_heat_based_automod.sql):

  • guild_automod_heat_config: Per-guild settings (enabled, decay_seconds, heat_per_violation JSONB)
  • guild_automod_heat_thresholds: Threshold definitions (heat_threshold, punishment_type, duration)

• Models (lightning/cogs/automod/models.py):

  • HeatConfig: Manages heat operations (add, get, reset) and punishment selection
  • HeatThreshold: Threshold + punishment pairs, sorted by heat level

• Integration (lightning/cogs/automod/cog.py):

  • Heat checked before applying rule punishment in check_message()
  • Falls back to original punishment if heat disabled or threshold not met
  • Tracks applied punishment type for correct message deletion behavior
  • Heat resets to 0 after punishment applied

• Commands: automod heat enable|disable|setheat|addthreshold|removethreshold|view|check|reset

Configuration Example

# Enable with 1h decay, configure heat values per violation type
/automod heat enable 3600
/automod heat setheat message-spam 2.0
/automod heat setheat invite-spam 5.0

# Define escalating thresholds
/automod heat addthreshold 5 WARN
/automod heat addthreshold 10 MUTE 10m
/automod heat addthreshold 20 KICK
/automod heat addthreshold 50 BAN 7d

Validation

• Heat values: positive numbers only
• Violation types: whitelist of valid automod rule names
• Thresholds: positive integers, duplicate detection
• Durations: only allowed for MUTE/BAN punishments

Opt-in system, disabled by default. No impact on existing automod behavior when disabled.

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