IB-WP-0016-T03: scale-aware planning

Replace generate plan's full-prompt dump with a compact summary that
reports selected-chunk counts, selected chapter numbers, per-workflow
call counts, prompt-word and token estimates, and a rough USD cost when
--cost-per-1k is supplied. Selection filters --chapter (label or number,
repeatable), --from-chapter / --to-chapter (numeric range), and --chunk
(repeatable id) shape the estimate. Budget caps --max-calls and
--cost-cap are reported as exceeds_* booleans so callers can fail fast
before run.

The old full per-workflow plan with prompts remains available behind
--full so deep inspection is opt-in instead of the default.

Whole-Lefevre estimate at default max_words=800: 146 chunks, 730 calls,
~518k prompt tokens, ~$155 at $0.30/1k. Chapters 3-5 only: 19 chunks,
95 calls, ~64k tokens. 87 tests pass.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

workplans/IB-WP-0016-lefevre-ebook-infospace-readiness.md

@@ -139,7 +139,7 @@ state_hub_task_id: "47de1110-36d0-4d63-bf87-389746509e03"
 
 ```task
 id: IB-WP-0016-T03
-status: in_progress
+status: done
 priority: high
 state_hub_task_id: "bee5c38a-f052-4edb-9313-b3a2ee5a6c26"
 ```

workplans/IB-WP-0018-adaptive-llm-routing-consumer.md

@@ -13,6 +13,7 @@ depends_on_workplans:
   - LLM-WP-0004
 related_workplans:
   - IB-WP-0016
+state_hub_workstream_id: "3d38642e-9d6d-4c7f-869f-b185a00bd0e6"
 ---
 
 # IB-WP-0018 — Adaptive LLM Routing — infospace-bench Consumer Wiring