chore(memory): BDR-108 effort round, LRN-181/182, BLK-024 resync pins, EVAL-038 sub-agent thinking unmeasured, journal, TODO parked LOW

.claude/memory/learnings.md

@@ -200,6 +200,8 @@ rules:
 | LRN-178 | 2026-09-28 | a top-level `source` added to a lib breaks every hermetic suite that copies that lib alone into a fixture; grep the `cp` lists before adding one, or source lazily inside the branch that needs it | adding `source` to profile.sh / toggle-external.sh / any lib the suites copy |
 | LRN-179 | 2026-09-28 | Skill `effort:` frontmatter shifts the MAIN LOOP for the rest of the turn on user slash invocation AND on interactive Skill-tool loads (last loaded wins, both directions, prompt cache kept); NOT applied in `-p`/headless; agent pins always honoured, unpinned agents inherit session | effort tiering; any skill or agent that must think more or less than the session |
 | LRN-180 | 2026-09-28 | Skill-tool effort override needs a paired tool call: a lone Skill(effort-*) call is a no-op; a load in the same message as another tool call applies (the paired call already sees it); re-load re-applies (text deduped); skills Claude loads alone (brainstorming, writing-plans) apply nothing | every orchestrator shift; amends LRN-179 |
+| LRN-181 | 2026-09-29 | Stacked skills share ONE effort level: skill `effort:` = last loaded wins, so a stack loaded in one build (design toolchain) with two levels gets an effort that depends on load order; a skill Claude loads alone applies nothing (LRN-180) | one level per stack in `lib/effort-pins.txt`; load the stack paired with the first Read; copy the stack level when vendoring a new design skill |
+| LRN-182 | 2026-09-29 | Effort/thinking baselines are generation-bound and aliases move silently: `sonnet` resolved sonnet-5 then sonnet-5-5 mid-period, Sonnet 5.5 recalibrated its effort levels; EVAL-036 measured one generation | re-run `lib/effort-audit.py` after an alias moves; cite the generation in any effort measurement; never pin a version for it (older gen never cheaper) |
 
 ---
 
@@ -1650,3 +1652,11 @@ Rule: when editing a doctrine file under structure locks, grep the test's lock s
 ## LRN-180 — Skill-tool effort override needs a paired tool call; a lone Skill call is a no-op (2.1.283)
 - **Context**: effort-tiering smoke. Six lone `Skill(effort-*)` / probe loads left `$CLAUDE_EFFORT` unchanged; every load issued in the same assistant message as another tool call applied, and the paired Bash already saw the new level. Re-loading an already-loaded shifter re-applies (text deduped: "already loaded above"). Final review: `brainstorming` / `writing-plans` loaded alone by ship-feature and init-project → their vendored xhigh pin inert. Amends [[LRN-179]].
 - **Apply**: `Skill(effort-<level>)` always travels with the step's first tool call, shift first; pair a downward shift with a pinned executor or a Read/Bash, never with a built-in judgment dispatch; before any built-in judgment dispatch, pair the own-level shift with it; skills Claude loads alone do not apply their pin → re-assert with a paired shift at the resumed planning step ([[BDR-107]]).
+
+## LRN-181 — Stacked skills share one effort level; a lone load applies none
+- **Context**: design toolchain loads 5-8 skills in one build. Skill `effort:` frontmatter = last loaded wins, both directions ([[LRN-179]]). Two levels inside the stack → effort depends on load order, invisible. Plus [[LRN-180]]: a Skill call Claude issues alone is a no-op.
+- **Apply**: one level per stack (`lib/effort-pins.txt` design section, census `stack_levels` lock, site-motion frontmatter matches); doctrine "load the stack paired with the first Read of the target file"; new vendored design skill → copy the stack level. [[BDR-108]]
+
+## LRN-182 — Effort baselines are generation-bound; model aliases move silently
+- **Context**: transcripts of the last weeks show `sonnet` → claude-sonnet-5 (3069 msgs) then claude-sonnet-5-5 (recent), `opus` → opus-5 then opus-5-5, `fable` → fable-5 then fable-5-1. API reference: Sonnet 5.5 recalibrated effort levels ("start at medium for agentic coding"). [[EVAL-036]] A/B ran on one generation.
+- **Apply**: after an alias moves (new model in a tier) re-run `python3 lib/effort-audit.py` and re-read the pins; write the generation next to any effort figure; keep aliases (latest = cheapest or same price, never pin a version for a measurement). [[BDR-108]]