fix: gate debug recommendation filter log behind shouldInject

[ranxianglei]

Problem

When config.debug: true, the recommendation filter logger.debug fired on EVERY message transform hook call — even when no nudge was being injected. In normal sessions with compressible ranges (almost always), this produced a log entry per message. The user saw constant [ACP Debug] Recommendation filter: entries and toast notifications even when there was nothing to compress.

Fix

Moved the recommendation filter logger.debug from its per-turn position (before shouldInject decision) to inside the shouldInject block. Now only fires when a nudge is actually being injected — i.e., when there is real compression to recommend.

Verification

• TypeScript: 0 errors
• Tests: 954 pass, 0 fail
• Build: 386.83 KB
• Deployed locally