Add tiered memory system with manual distillation

- config.py: memory_budget_long/mid/short settings (overridable in .env)
- memory_distiller.py: distill_short (no LLM), distill_mid, distill_long (LLM)
- routers/distill.py: POST /distill/{short,mid,long,all} endpoints
- context_loader.py: rewrote to load long→mid→short order with include_* toggles
- routers/chat.py: ChatRequest gains include_long/mid/short fields
- routers/files.py: MEMORY_LONG/MID/SHORT.md added to ALLOWED set
- main.py: register distill router
- static/index.html: context bar — tier selector, L/M/S memory toggles,
  distill buttons with status feedback; send includes tier + memory flags
- inara/MEMORY_LONG.md: migrated from MEMORY.md + Cortex/Talk bot notes
- inara/MEMORY_MID.md, MEMORY_SHORT.md: stubs ready for distillation

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

cortex/routers/files.py

@@ -12,9 +12,12 @@ ALLOWED = {
     "SOUL.md",
     "IDENTITY.md",
     "USER.md",
-    "MEMORY.md",
     "PROTOCOLS.md",
     "CONTEXT_TIERS.md",
+    "MEMORY.md",        # legacy — kept for reference
+    "MEMORY_LONG.md",
+    "MEMORY_MID.md",
+    "MEMORY_SHORT.md",
 }