remove el_runtime.c — runtime is 100% native El

el_runtime.c and el_runtime.h removed from the active runtime directory
(archived copies remain in el-compiler/runtime/legacy/).
tools/lsp/build.sh removed as it depended on el_runtime.c directly.
AGENTS.md updated to reflect el_seed.c as the sole C dependency.

tools/lsp/build.sh

@@ -1,125 +0,0 @@
-#!/usr/bin/env bash
-# tools/lsp/build.sh — Build the El LSP server binary end-to-end.
-#
-# Pipeline:
-#   1. Compile el-lsp.el → C source (using elc)
-#   2. Compile C source → binary (using cc with el_runtime.c)
-#
-# Output: tools/lsp/dist/el-lsp
-#
-# Prerequisites:
-#   - dist/platform/elc  (the El self-hosted compiler)
-#   - el-compiler/runtime/el_runtime.c + el_runtime.h
-#   - cc (clang or gcc), libcurl, pthreads
-#
-# Usage:
-#   cd <el-root>
-#   ./tools/lsp/build.sh
-#
-#   Or from anywhere:
-#   EL_HOME=/path/to/el-root ./tools/lsp/build.sh
-
-set -euo pipefail
-
-# ── Locate el root ─────────────────────────────────────────────────────────
-SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
-EL_HOME="${EL_HOME:-$(cd "${SCRIPT_DIR}/../.." && pwd)}"
-
-ELC="${ELC:-${EL_HOME}/dist/platform/elc}"
-RUNTIME_DIR="${EL_HOME}/el-compiler/runtime"
-LSP_DIR="${SCRIPT_DIR}"
-OUT_DIR="${LSP_DIR}/dist"
-
-# ── Validate prerequisites ─────────────────────────────────────────────────
-echo "==> Checking prerequisites..."
-echo "    EL_HOME    = ${EL_HOME}"
-echo "    elc        = ${ELC}"
-echo "    runtime    = ${RUNTIME_DIR}"
-
-if [ ! -x "${ELC}" ]; then
-    echo "error: elc not found at ${ELC}" >&2
-    echo "       Build it first: cd <el-root> && make  (or compile elc-bootstrap.c)" >&2
-    exit 1
-fi
-
-if [ ! -f "${RUNTIME_DIR}/el_runtime.c" ]; then
-    echo "error: el_runtime.c not found at ${RUNTIME_DIR}" >&2
-    exit 1
-fi
-
-if [ ! -f "${LSP_DIR}/el-lsp.el" ]; then
-    echo "error: el-lsp.el not found at ${LSP_DIR}" >&2
-    exit 1
-fi
-
-mkdir -p "${OUT_DIR}"
-
-# ── Compile El → C ─────────────────────────────────────────────────────────
-C_OUT="${OUT_DIR}/el-lsp.c"
-echo "==> Compiling El → C..."
-echo "    ${LSP_DIR}/el-lsp.el  →  ${C_OUT}"
-
-# el-lsp.el uses only standard El builtins (no import statements needed).
-# The elc compiler emits #include "el_runtime.h" at the top of the output.
-"${ELC}" "${LSP_DIR}/el-lsp.el" > "${C_OUT}"
-
-echo "    Done ($(wc -l < "${C_OUT}") lines of C)."
-
-# ── Compile C → binary ─────────────────────────────────────────────────────
-BIN="${OUT_DIR}/el-lsp"
-echo "==> Compiling C → binary..."
-echo "    ${C_OUT} + el_runtime.c  →  ${BIN}"
-
-cc -std=c11 -O2 \
-    -I "${RUNTIME_DIR}" \
-    -o "${BIN}" \
-    "${C_OUT}" "${RUNTIME_DIR}/el_runtime.c" \
-    -lcurl -lpthread
-
-echo "    Done."
-
-# ── Summary ────────────────────────────────────────────────────────────────
-echo
-echo "==> Build complete."
-echo
-echo "    Binary : ${BIN}"
-echo "    Size   : $(du -sh "${BIN}" | cut -f1)"
-echo
-echo "    Install system-wide:"
-echo "      sudo cp ${BIN} /usr/local/bin/el-lsp"
-echo
-echo "    Quick smoke test (initialize + shutdown):"
-cat << 'SMOKETEST'
-      python3 - << 'PY'
-import subprocess, json
-
-def frame(body):
-    b = body.encode()
-    return f"Content-Length: {len(b)}\r\n\r\n".encode() + b
-
-def send(proc, obj):
-    proc.stdin.write(frame(json.dumps(obj)))
-    proc.stdin.flush()
-
-def recv(proc):
-    hdr = b""
-    while not hdr.endswith(b"\r\n\r\n"):
-        hdr += proc.stdout.read(1)
-    cl = int([l for l in hdr.decode().split("\r\n") if l.startswith("Content-Length")][0].split(": ")[1])
-    return json.loads(proc.stdout.read(cl))
-
-import sys, os
-bin_path = sys.argv[1] if len(sys.argv) > 1 else "./dist/el-lsp"
-proc = subprocess.Popen([bin_path], stdin=subprocess.PIPE, stdout=subprocess.PIPE)
-send(proc, {"jsonrpc":"2.0","id":1,"method":"initialize","params":{"capabilities":{}}})
-r = recv(proc)
-print("initialize:", r.get("result", {}).get("serverInfo", {}).get("name"), "OK" if "result" in r else "FAIL")
-send(proc, {"jsonrpc":"2.0","id":2,"method":"shutdown","params":{}})
-r = recv(proc)
-print("shutdown:", "OK" if r.get("result") is None else "FAIL")
-send(proc, {"jsonrpc":"2.0","method":"exit","params":{}})
-proc.wait()
-print("exit: OK")
-PY
-SMOKETEST
-