fix(observer/bridge): PROMPT_ONLY_RE — regex escaping + ellipsis prefix handling (v0.5.45) #task-619

Observer: \\\\s (4-backslash) → \\s (2-backslash) in template literal regex
  - Per known-issues rule: regex literals need 2-backslash for \s, \d etc.
  - Old: literal \\s matched, new: whitespace class matched correctly

http-bridge: /^[\s\\\/]*[\w_.-]+\s*[>»$#]\s*$/ → /^.*[>»$#]\s*$/
  - Old pattern failed on ellipsis '…' prefix (U+2026 not in charset)
  - Terminal prompt '…\\gravity_control >' was passing through as cmd
  - New pattern: any text ending with prompt marker is skipped

extension/src/http-bridge.ts

@@ -273,7 +273,7 @@ function _handlePending(req: any, res: any, ctx: HttpBridgeContext) {
                 }
                 // v12: Validate extracted text is not just a prompt fragment
                 // Skip enrichment only if it looks like a bare prompt (e.g. "\\gravity_control >")
-                const PROMPT_ONLY_RE = /^[\s\\\/]*[\w_.-]+\s*[>»$#]\s*$/;
+                const PROMPT_ONLY_RE = /^.*[>»$#]\s*$/;
                 if (!PROMPT_ONLY_RE.test(extracted) && extracted.length > 3) {
                     enrichedCmd = extracted.substring(0, 200);
                     enrichedDesc = `[${rawCmd}] ${rawDesc}`;