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/distill.py

@@ -0,0 +1,44 @@
+"""
+Manual memory distillation endpoints.
+
+  POST /distill/short  — roll session logs → MEMORY_SHORT.md (no LLM)
+  POST /distill/mid    — summarize short   → MEMORY_MID.md   (LLM)
+  POST /distill/long   — integrate mid     → MEMORY_LONG.md  (LLM)
+  POST /distill/all    — run all three in sequence
+"""
+from fastapi import APIRouter
+from memory_distiller import distill_short, distill_mid, distill_long
+
+router = APIRouter(prefix="/distill")
+
+
+@router.post("/short")
+async def do_distill_short() -> dict:
+    return {"ok": True, **distill_short()}
+
+
+@router.post("/mid")
+async def do_distill_mid() -> dict:
+    result = await distill_mid()
+    return {"ok": "error" not in result, **result}
+
+
+@router.post("/long")
+async def do_distill_long() -> dict:
+    result = await distill_long()
+    return {"ok": "error" not in result, **result}
+
+
+@router.post("/all")
+async def do_distill_all() -> dict:
+    short_result = distill_short()
+    mid_result = await distill_mid()
+    if "error" in mid_result:
+        return {"ok": False, "short": short_result, "mid": mid_result}
+    long_result = await distill_long()
+    return {
+        "ok": "error" not in long_result,
+        "short": short_result,
+        "mid": mid_result,
+        "long": long_result,
+    }