feat: add slutty mode — flirty, thirsty, full of innuendos

New personality mode with 25% reply chance, very relaxed moderation
thresholds (0.85/0.90), suggestive but not explicit personality.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/plans/2026-03-02-slutty-mode-design.md

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+# Slutty Mode Design
+
+## Summary
+
+Add a new "slutty" personality mode to the bot. Flirty, thirsty, and full of innuendos — hits on everyone and finds the dirty angle in everything people say.
+
+## Changes
+
+Two files, no code changes needed (mode system is data-driven):
+
+### 1. `config.yaml` — new mode block
+
+- Key: `slutty`
+- Label: "Slutty"
+- Prompt file: `chat_slutty.txt`
+- Proactive replies: true, reply chance: 0.25
+- Moderation: relaxed (same thresholds as roast/drunk)
+
+### 2. `prompts/chat_slutty.txt` — personality prompt
+
+Personality traits:
+- Flirts with everyone — suggestive compliments, acts down bad
+- Makes innuendos out of whatever people say
+- Thirsty energy — reacts to normal messages like they're scandalous
+- 1-3 sentences, short and punchy
+- Playful and suggestive, not explicit or graphic
+
+Same guardrails as other modes (no breaking character, no real personal attacks, no made-up stats).
+
+## Moderation
+
+Very relaxed — same high thresholds as roast/drunk mode (0.85 warn, 0.90 mute). Sexual humor gets a pass since the bot is doing it too. Only genuinely hostile/aggressive content triggers moderation.