env: session-scoped env via -e flag; remove daemon-global env export

- s/sh: add -e VAR1,VAR2 flag to inject named vars from frontend env
  into session spec as env.NAME=VALUE lines
- s/sh: remove $MOUNT/env export loop (global env file removed)
- Bump core and 9p submodules

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

9p

@@ -1 +1 @@
-Subproject commit eef8ccecd93aa4c5a0ec604257cb22d3eaef68eb
+Subproject commit 0c585b4346c40275e47adedc554d75e579e990db

core

@@ -1 +1 @@
-Subproject commit 44bff71a65da2b5703b10c70d122c30c67c53115
+Subproject commit 97e453d453a5ddf21594764c35acf70278959070

scripts/s/sh

@@ -43,6 +43,7 @@ Flags:
   -backend BACKEND  backend override (e.g. ollama, anthropic)
   -model MODEL      model override
   -agent AGENT      agent config name
+  -e VAR1,VAR2      inject env vars from this shell into the session
   -help             show this help
 
 Input at the prompt:
@@ -69,7 +70,7 @@ EOF
 
 # Parse flags
 new=0; resume=0; id_flag=; name=
-backend=; model=; agent=; cwd=
+backend=; model=; agent=; cwd=; env=
 while [ $# -gt 0 ]; do
     case $1 in
         -new)      new=1 ;;
@@ -80,6 +81,7 @@ while [ $# -gt 0 ]; do
         -model)    model=$2;   shift ;;
         -agent)    agent=$2;   shift ;;
         -cwd)      cwd=$2;     shift ;;
+        -e)        env=$2; shift ;;
         -help)     usage ;;
         *) die "unknown flag: $1" ;;
     esac
@@ -94,6 +96,13 @@ write_new() {
         [ -n "$backend" ] && printf 'backend=%s\n' "$backend"
         [ -n "$model"   ] && printf 'model=%s\n'   "$model"
         [ -n "$agent"   ] && printf 'agent=%s\n'   "$agent"
+        if [ -n "$env" ]; then
+            IFS=, read -ra _vars <<< "$env"
+            for _v in "${_vars[@]}"; do
+                eval "_val=\$$_v"
+                [ -n "$_val" ] && printf 'env.%s=%s\n' "$_v" "$_val"
+            done
+        fi
         true
     } > "$MOUNT/s/new" || die "write s/new"
 }
@@ -145,11 +154,6 @@ fi
 S=$MOUNT/s/$id
 chat_off=$(wc -c < "$S/chat" 2>/dev/null || echo 0)
 
-# Export daemon environment to this shell.
-while IFS='=' read -r k v; do
-    [ -n "$k" ] && export "$k=$v"
-done < "$MOUNT/env" 2>/dev/null || true
-
 trap '
     [ "$(tr -d "[:space:]" < "$S/state" 2>/dev/null)" = "idle" ] && exit
     printf "\n" >&2; printf "stop\n" > "$S/ctl"