fix: session store perms + codex prompt fallback (#1049) (thanks @YuriNachos)

chore: temp landpr 1049 staging

docs/tools/slash-commands.md

@@ -94,6 +94,7 @@ Notes:
 - `/restart` is disabled by default; set `commands.restart: true` to enable it.
 - `/verbose` is meant for debugging and extra visibility; keep it **off** in normal use.
 - `/reasoning` (and `/verbose`) are risky in group settings: they may reveal internal reasoning or tool output you did not intend to expose. Prefer leaving them off, especially in group chats.
+- **Unknown slash commands:** if a command-only message starts with `/foo` and no built-in or skill command matches, Clawdbot looks for `~/.codex/prompts/foo.*` (or `$CODEX_HOME/prompts/foo.*`) and uses that file as the request body (front matter is stripped). Arguments are available as `$1`, `$2`, and `$*`.
 - **Fast path:** command-only messages from allowlisted senders are handled immediately (bypass queue + model).
 - **Group mention gating:** command-only messages from allowlisted senders bypass mention requirements.
 - **Inline shortcuts (allowlisted senders only):** certain commands also work when embedded in a normal message and are stripped before the model sees the remaining text.