Add devCorrectionLog.md, parallel sim horizons in L3

- .claude/devCorrectionLog.md: interaction pattern corrections for
  future instances (additive clarifications, no idle subagents, etc.)
- M3 hub L3: horizons run in parallel, not sequential
- Mention correction log in CLAUDE.md and all subdirectory AGENTS.md

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

core/AGENTS.md

@@ -1,7 +1,7 @@
 # AGENTS.md — Ada border (D1) + invariant vault
 
 Local guide for `mafiabot_core`. Repo-wide map and rules: [`../AGENTS.md`](../AGENTS.md);
-working agreements: [`../CLAUDE.md`](../CLAUDE.md).
+working agreements: [`../CLAUDE.md`](../CLAUDE.md). Correction log: [`../.claude/devCorrectionLog.md`](../.claude/devCorrectionLog.md).
 
 ## What this is
 

core/CLAUDE.md

@@ -32,6 +32,8 @@ Per-unit commands and gotchas live in that unit's `AGENTS.md`. Toolchains (ponyc
 
 When spawning background agents (Haiku for research, etc.), **keep working on the main task while they run**. Don't wait idle — fold in results as they arrive, edit other files, or advance unrelated build steps. Background agents are cheap parallelism; wasting the main context window on waiting defeats the purpose.
 
+Correction log at `.claude/devCorrectionLog.md`.
+
 ## Docs map
 
 - `README.md` — the project and its intent.

core/docs/plans/M3-sims-hub.md

@@ -62,7 +62,8 @@ different runtime suited to its math.
   unbounded point estimates. Uncertainty is a first-class value, not an afterthought.
 - **L3 (C5):** all sims are **tick-advanced and continuous** — fine-grained ticks (RTS-style).
   Base speed **90:1** (1s wall = 90s sim). Longer horizons run at higher velocity with coarser
-  steps and update less frequently. No horizon runs slower than 90:1.
+  steps and update less frequently. Each horizon runs **in parallel** — they are concurrent,
+  not sequential. No horizon runs slower than 90:1.
 - **L4 (C4):** sims are **read-only from traders' perspective** — a query never mutates sim
   state. Calibration happens only from Data Feeds (M2).
 - **L5 (C4):** each sim type is **independent** — failure in one sim does not cascade to others.

core/src/endocrine/AGENTS.md

@@ -1,7 +1,7 @@
 # AGENTS.md — endocrine organs (R / Octave)
 
 Local guide for `src/endocrine`. Repo-wide map and rules: [`../../AGENTS.md`](../../AGENTS.md);
-working agreements: [`../../CLAUDE.md`](../../CLAUDE.md).
+working agreements: [`../../CLAUDE.md`](../../CLAUDE.md). Correction log: [`../../.claude/devCorrectionLog.md`](../../.claude/devCorrectionLog.md).
 
 ## What this is
 

core/src/ichor/AGENTS.md

@@ -1,7 +1,7 @@
 # AGENTS.md — Ichor bus (Pony)
 
 Local guide for `src/ichor`. Repo-wide map and rules: [`../../AGENTS.md`](../../AGENTS.md);
-working agreements: [`../../CLAUDE.md`](../../CLAUDE.md).
+working agreements: [`../../CLAUDE.md`](../../CLAUDE.md). Correction log: [`../../.claude/devCorrectionLog.md`](../../.claude/devCorrectionLog.md).
 
 ## What this is