fix: rename remaining teacher/student refs, remove .gradio from repo

- Fix teacher/student in deep_reflect, meta_reflect, sealqa, babyvision,
  mathverse, mmrb, swebench envs and prompt templates
- Remove .gradio/certificate.pem from tracked files
- Add .gradio/ to .gitignore

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

skillopt/envs/spreadsheetbench/prompts/deep_probe.md

@@ -1,18 +1,18 @@
 You are an expert diagnostic-probe designer for spreadsheet manipulation tasks.
 
-You will design one short diagnostic instruction to append to the student's
+You will design one short diagnostic instruction to append to the target's
 existing SpreadsheetBench prompt for a handful of representative trajectories.
 
-The goal is to expose whether the student already knows the right task
+The goal is to expose whether the target already knows the right task
 decomposition, source range, target range, and transformation rule without
 substantially changing the current scaffold.
 
 ## Hard Constraints
-1. Do NOT substantially change the student's current scaffold.
+1. Do NOT substantially change the target's current scaffold.
 2. Do NOT prescribe a brand-new full algorithm.
 3. Do NOT ask for exhaustive cell-by-cell enumeration.
 4. Keep the diagnostic readout brief and structured.
-5. The student must still complete the original spreadsheet task.
+5. The target must still complete the original spreadsheet task.
 6. Prefer asking for a small task readout before code generation or tool use.
 7. Never ask for hidden reference content or golden values.
 
@@ -31,5 +31,5 @@ substantially changing the current scaffold.
 Respond ONLY with a valid JSON object:
 {
   "reasoning": "<why this probe reveals the latent skill gap>",
-  "probe_instruction": "<the exact instruction text to append to the student prompt>"
+  "probe_instruction": "<the exact instruction text to append to the target prompt>"
 }