tools: add repl-block, check-tangle; move existing tools into memex

New tools (projects/<tool>/ — standalone, git-committed):
- repl-block: extract and pipe lisp blocks from org files to the REPL
- check-tangle: tangle + compile in one step, reports errors

Existing tools moved from ~/.opencode/bin/ into memex (survives reinstalls):
- repl, tangle, org-eval, verify-repl

AGENTS.md updated:
- Tool reference table with all 7 tools
- Package reference table for passepartout and cl-tty
- Updated tangle command to use project-local tools

.opencode/commands/ added: check-parens, repl-block, check-tangle commands

projects/check-tangle/check-tangle

@@ -0,0 +1,62 @@
+#!/usr/bin/env bash
+# Tangle an .org file and compile the resulting .lisp with SBCL.
+# Reports the first compile error with line numbers.
+#
+# Usage: check-tangle <file.org>
+#   Exit 0 if compile succeeds, 1 if tangled or compilation fails
+
+set -euo pipefail
+
+if [ $# -ne 1 ]; then
+    echo "Usage: check-tangle <file.org>" >&2
+    exit 2
+fi
+
+ORG_FILE="$1"
+
+if [ ! -f "$ORG_FILE" ]; then
+    echo "Error: File not found: $ORG_FILE" >&2
+    exit 1
+fi
+
+# Determine the tangle target from the org file
+TANGLE=$(grep -m1 'header-args.*:tangle' "$ORG_FILE" | sed 's/.*:tangle //' | head -1 || true)
+if [ -z "$TANGLE" ]; then
+    echo "SKIP: $ORG_FILE — no :tangle header" >&2
+    exit 0
+fi
+
+# Resolve relative tangle path
+ORG_DIR=$(dirname "$ORG_FILE")
+LISP_FILE=$(cd "$ORG_DIR" && realpath -m "$TANGLE" 2>/dev/null || echo "$ORG_DIR/$TANGLE")
+
+echo "Tangling: $ORG_FILE → $LISP_FILE" >&2
+
+# Tangle using opencode's tangle tool
+TANGLE_CMD=$(command -v tangle 2>/dev/null || echo "/home/user/.opencode/bin/tangle")
+if ! "$TANGLE_CMD" "$ORG_FILE" 2>/dev/null; then
+    echo "FAIL: Tangling $ORG_FILE failed" >&2
+    exit 1
+fi
+
+if [ ! -f "$LISP_FILE" ]; then
+    echo "SKIP: Tangle target $LISP_FILE not found after tangling" >&2
+    exit 0
+fi
+
+echo "Compiling: $LISP_FILE" >&2
+
+# Compile with SBCL, capturing errors
+OUTPUT=$(sbcl --noinform --no-userinit --disable-debugger --quit \
+    --eval "(handler-case
+                (progn (compile-file \"$LISP_FILE\") (print :OK))
+              (error (c) (print c) (sb-ext:exit :code 1)))" 2>&1 || true)
+
+if echo "$OUTPUT" | grep -q ":OK"; then
+    echo "OK: $ORG_FILE compiles cleanly" >&2
+    exit 0
+else
+    echo "$OUTPUT" | grep -v '^;' | grep -v '^$' | head -5
+    echo "FAIL: $ORG_FILE — compilation error" >&2
+    exit 1
+fi