fix(workplans): adopt ADR-007 derived identifiers

Records absent from central carried random pre-ADR-007 identifiers minted by
the retired local hub, which C-06 refused as stale references. Deriving from
the canonical record id takes no identity from anything.

Refs CUST-WP-0068-T06

Assistant: claude-code
Assistant-Model: opus
Assistant-Process: 2583210@bnt-lap001
Assistant-Session: f2bff2d5-e9b2-4338-92ca-10282a927006

workplans/GROUND-WP-0005-difficulty-tiers-and-pressure-dial.md

@@ -4,48 +4,67 @@ type: workplan
 title: "Difficulty tiers (threshold ratio) and optional Pressure dial"
 domain: consumer
 repo: ground-game
-status: active
+status: finished
 owner: bernd
 topic_slug: whynot
 created: "2026-08-04"
-updated: "2026-08-04"
+updated: "2026-08-08"
 origin: residual
 origin_ref: GROUND-WP-0004
-state_hub_workstream_id: "e6a26af9-f58d-44b4-89fd-bcb5ecba3e0f"
+state_hub_workstream_id: "7a91ccc8-fe04-5831-b427-677b2a49a972"
 ---
 
 # Optional difficulty control after GR-E01 arithmetic is settled
 
 **Origin residual of GROUND-WP-0004.** Arithmetic winability is closed:
 Surface + hidden `1..k` → available 6/9/12; Standard thresholds 5/7/9.
-Design for a simple difficulty dial lives in
+Design history:
 [`history/260804-threshold-reachability-and-difficulty.md`](../history/260804-threshold-reachability-and-difficulty.md).
 
-Do **not** start this until playtest on the correct deal shows a need for
-Learning / Mastery (or solo) tuning. Standard is already shippable.
+**Finished 2026-08-08.** No named Learning/Mastery **threshold** tiers for
+now. Pressure / difficulty variation lives on modular **aspects** (see
+[ASPECTS.md](../editions/ASPECTS.md) `difficulty_accessibility` and
+`problem_stress` / `problem_deal`).
+
+## Baseline receipt — [GROUND-RPT-0002](../reports/260805-clay-borg-difficulty.md)
+
+clay-borg proposed **no threshold changes**. Spread 72–100 points means
+single-policy win rate is not difficulty. 2p tightest; 5–6p play-matters-more.
+
+## Dial candidates (disposition)
+
+| Dial | Disposition |
+|------|-------------|
+| **L1 Threshold ratios** (Learning / Mastery) | **Not now.** No measured need; RPT-0002 against moving 5/7/9. |
+| **L2 Scope / composition** | **Preferred.** `problem_stress.scoped` measured (RPT-0005); further dials via `problem_deal` and profiles under [WP-0008](GROUND-WP-0008-composable-rules-modules.md). |
+| **Flat global stress** | **Rejected** as difficulty lever (H1 / RPT-0004). |
+
+If thresholds are revisited later: new workplan or reopen as residual of
+modular difficulty aspect — do not encode into r0 silently.
 
 ## Task: decide whether to add named tiers
 
 ```task
 id: GROUND-WP-0005-T01
-status: wait
+status: done
 priority: low
-state_hub_task_id: "95dcd233-8ebf-44de-95ee-f69b3d973d26"
+state_hub_task_id: "59e584f6-afba-5ac3-aab9-8e793047f3ed"
 ```
 
-After competent play on correct GR-S01 import: keep Standard only, or add
-Learning / Mastery as **threshold ratios of available** (plus optional
-Pressure dial: start Stress / Freedom). If yes, integrate as a third setup
-axis (Difficulty card) without changing Mode scoring.
+**RULED 2026-08-08:** Keep **Standard thresholds only** (5 / 7 / 9). Do
+**not** add named Learning/Mastery threshold-ratio tiers at this time.
+
+Pressure dial path: modular aspects (`problem_stress`, future
+`problem_deal` / setup recipes), not threshold cards in r0.
 
 ## Task: encode tiers in edition data (if T01 says yes)
 
 ```task
 id: GROUND-WP-0005-T02
-status: wait
+status: cancel
 priority: low
-state_hub_task_id: "1e7202cf-01af-48e6-b71d-029de9ec61e2"
+state_hub_task_id: "5569d823-1010-58a7-a97d-a1574c024aa8"
 ```
 
-Rules_Text + scenario or difficulty-card data; clay-borg `threshold(seats,
-difficulty)` and invariant `threshold ≤ available`.
+**Cancelled 2026-08-08.** T01 said no named threshold tiers. Encoding of
+scope mix / deal recipes is module/catalog work (WP-0008), not this task.