Reorg step 1: consolidate repo under core/, drop the mafiabot label

Mechanical structure-only pass (no document/guide content edits):

- Move src/ichor, src/endocrine, and docs/ into core/; the old top-level
  mafiabot_core/ becomes core/. Everything now lives under a single core/ root.
- Drop the "mafiabot" label from the Ada/Alire crate: core.gpr (project Core),
  alire.toml name = "core"; the generated *_config.* regenerate as core_config.*.
- Repoint build-critical wiring only:
  - .claude/skills/run-sica-fondt/smoke.sh (ponyc + Ada + COBOL paths)
  - core/src/endocrine R source()/runner paths and the test glob
  - .github/workflows/ci.yml (working-directory + gpr name)

Verified green: smoke ALL GREEN (Pony Ichor, Ada core crate + tests, COBOL E1
vault); R endocrine 14/0; Octave ETR 26/0/1.

Deferred (reserved for a less-ephemeral doc/guide pass): docmap.yaml, the guide
files and nested AGENTS.md/README prose + now-stale relative links, SOUL.md, and
the deeper ring/storage restructure.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015hmgREHNsxYCuim33yUF2c

core/src/endocrine/AGENTS.md

@@ -0,0 +1,30 @@
+# 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).
+
+## What this is
+
+The **endocrine array** — slow-signal organs that modulate the system: the R
+**Drive-Box** (`drive_box.R`, `driver_*.R`, `endocrine_array.R`, `priors.R`) and
+the Octave **ETR** under `etr/`. See `Plan.md` here and `etr/etr_invariants.md`
+for design.
+
+## Build & run
+
+Toolchains (R 4.3.3, Octave 8.4) are installed each session by the SessionStart
+hook. Run the organ tests directly:
+
+```bash
+src/endocrine/run_tests.sh        # R Drive-Box + drivers
+src/endocrine/etr/run_etr_tests.sh   # Octave ETR
+```
+
+(Not yet wired into the top-level `run-sica-fondt` smoke driver — run them here.)
+
+## Local notes
+
+- Pure R/Octave; no compile step. Each `test_*.R` / `test_etr.m` pairs with its
+  `driver`/source file.
+- ETR invariants are documented in `etr/etr_invariants.md` — read before
+  changing `etr.m`.