Claude Code .claudeignore + Proactive Compact at 70% Context Threshold

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Three complementary token management tactics: create `.claudeignore` (gitignore syntax) to exclude build artifacts before they consume context, trigger `/compact` with a focus area at 70% context capacity rather than waiting for 100% to preserve coherent working state instead of forcing a cold restart, and delegate codebase exploration to subagents that return only relevant line ranges (saves 40%+ input tokens). Proactive compaction at 70% is the critical insight — it preserves essential state while summarizing noise at the point of maximum context coherence, not at the point of overflow.