feat: enable GrowthBook local gate defaults for P0/P1 features
Add LOCAL_GATE_DEFAULTS mapping in growthbook.ts with 27 feature gate
defaults (25 boolean + 2 object config). Insert local defaults into the
fallback chain of all getter functions so they work regardless of whether
GrowthBook is enabled or disabled:
env overrides → config overrides → in-memory cache → disk cache
→ LOCAL_GATE_DEFAULTS → caller defaultValue
P0 (local): keybindings, streaming tool exec, cron, JSON tools,
ultrathink, explore/plan agents, deep link, immediate model switch
P1 (API): session memory, auto memory, prompt suggestions, brief mode,
verification agent, away summary, auto dream, idle return prompt
Kill switches: 10 gates kept true to prevent remote disable
New compile flags: AGENT_TRIGGERS, ULTRATHINK, BUILTIN_EXPLORE_PLAN_AGENTS,
LODESTONE, EXTRACT_MEMORIES, VERIFICATION_AGENT, KAIROS_BRIEF, AWAY_SUMMARY
Bypass all local defaults: CLAUDE_CODE_DISABLE_LOCAL_GATES=1
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