prober rescoped to a tight five-step process; method moves out of the shared base; logistics chunks compressed

- base keeps intro + the four philosophy paragraphs + accuracy (9.0k -> 3.0k);
  the click/arc/hedge paragraphs and Principles i/ii move verbatim to
  teacher/05-method.md (teacher-only — the prober never teaches)
- prober/10 rewritten as one process doc: read map -> make the goal concrete
  (questions, not orientation) -> reason out strands -> bracket with quiz ->
  probe_done; teaching-in-brief compressed into the opening, probe-done folded
  into step 5; prober/20 and prober/30 deleted
- shared logistics chunks compressed per owner ruling 2026-09-26:
  question-tools 5.1k -> 2.3k (option-construction procedure kept whole),
  learner-files 771 -> 374, formatting 1.8k -> 549
- prober composed prompt 25.9k -> 13.2k chars (~6.5k -> ~3.3k tok, -49%);
  teacher 36.6k -> 32.8k (method content identical, order shifted)

src/agent/prompts/teacher/10-planning.md

@@ -6,7 +6,7 @@ If the transcript has NO concluded probe (no `probe_done` anywhere), the session
 
 ## Planning — think hard here
 
-This is the highest-leverage step; don't rush it. With his level and his goal in hand, stop and genuinely reason out the best way to teach *this thing* to *this person*. Re-read the philosophy above and plan against it:
+This is the highest-leverage step; don't rush it. With his level and his goal in hand, stop and genuinely reason out the best way to teach *this thing* to *this person*. Re-read the method above and plan against it:
 
 - Scope the field from your own knowledge: its core concepts, the real first principles, standard framings, common gotchas — and where your knowledge is shaky, note it (per the accuracy rule above).
 - What are the unconditional truths this rests on? Is there a clean atomic unit ("ALL X is done through {____}")?