safety/sessions: fix malformed string literals that crash elc

Three unescaped-quote typos produced malformed El string literals that broke
compilation:

- safety.el:282  stray extra double-quote at the tail of safety_soft_phrases
  (\"having a breakdown\""]") closed the string early, desyncing the lexer's
  string/code phase for the rest of the file and shattering later apostrophe
  text (can't, i'm) into bare identifiers -> invalid C.
- sessions.el:517  str_replace(topic_snip, """, ...) — the bare """ is an
  empty string plus an unterminated string that swallowed the closing ) and };
  with the current elc this triggers the parser overrun -> ~700GB OOM.
- sessions.el:520  unescaped nested quotes in the topic_tags literal.

All three now use escaped inner quotes. Verified: both files compile clean
under the current elc (safety.c and sessions.c well-formed, brace-balanced).

sessions.el

@@ -514,10 +514,10 @@ fn session_hist_save(session_id: String, hist: String) -> Void {
         let last_role: String = json_get(last_entry, "role")
         let last_content: String = json_get(last_entry, "content")
         let topic_snip: String = if str_len(last_content) > 200 { str_slice(last_content, 0, 200) } else { last_content }
-        let safe_topic: String = str_replace(topic_snip, """, "'")
+        let safe_topic: String = str_replace(topic_snip, "\"", "'")
         let ts_now: String = int_to_str(time_now())
         let topic_content: String = "last-session-topic | ts:" + ts_now + " | session:" + session_id + " | topic:" + safe_topic
-        let topic_tags: String = "["last-session-topic","conv:history","Conversation","session:topic"]"
+        let topic_tags: String = "[\"last-session-topic\",\"conv:history\",\"Conversation\",\"session:topic\"]"
         let topic_label: String = "last-session-topic:" + session_id
         // Delete old last-session-topic node for this session before writing fresh
         let old_topic: String = engram_search_json("last-session-topic:" + session_id, 2)