feat(tasks): add inherited context and resilient LLM execution

Add read-only task context inheritance, ordered task-level LLM failover, live Worker controls, cascading task cleanup, FIFO task concurrency, cancellation diagnostics, UI updates, tests, build script, and changelog.

build.sh

@@ -0,0 +1,65 @@
+#!/usr/bin/env bash
+# ARTEX 单二进制构建脚本：静态导出前端并嵌入 Go 二进制。
+#
+# 可选环境变量：
+#   ARTEX_TARGET_OS=linux             目标系统，默认当前系统
+#   ARTEX_TARGET_ARCH=amd64           目标架构，默认当前架构
+#   ARTEX_BUILD_VERSION=v0.3.0        构建版本，默认取 git describe
+#   ARTEX_OUTPUT=/path/to/artex       输出路径
+#   ARTEX_SKIP_NPM_CI=1               跳过 npm ci，复用现有依赖
+#   ARTEX_GOSUMDB=sum.golang.org      Go checksum database
+set -euo pipefail
+
+cd "$(cd "$(dirname "$0")" && pwd)"
+
+info() { printf '\033[36m[*]\033[0m %s\n' "$*"; }
+ok() { printf '\033[32m[+]\033[0m %s\n' "$*"; }
+die() { printf '\033[31m[x]\033[0m %s\n' "$*" >&2; exit 1; }
+
+command -v go >/dev/null 2>&1 || die "未检测到 Go（项目需要 Go 1.26 或更高版本）"
+command -v npm >/dev/null 2>&1 || die "未检测到 npm（前端静态构建需要 Node.js/npm）"
+command -v rsync >/dev/null 2>&1 || die "未检测到 rsync"
+
+ARTEX_GOSUMDB="${ARTEX_GOSUMDB:-sum.golang.org}"
+ARTEX_TARGET_OS="${ARTEX_TARGET_OS:-$(GOSUMDB="$ARTEX_GOSUMDB" go env GOOS)}"
+ARTEX_TARGET_ARCH="${ARTEX_TARGET_ARCH:-$(GOSUMDB="$ARTEX_GOSUMDB" go env GOARCH)}"
+
+if [ -z "${ARTEX_BUILD_VERSION:-}" ]; then
+  if command -v git >/dev/null 2>&1 && git rev-parse --is-inside-work-tree >/dev/null 2>&1; then
+    ARTEX_BUILD_VERSION="$(git describe --tags --always --dirty)"
+  else
+    ARTEX_BUILD_VERSION="dev"
+  fi
+fi
+
+ARTEX_BINARY_NAME="artex"
+[ "$ARTEX_TARGET_OS" = "windows" ] && ARTEX_BINARY_NAME="artex.exe"
+ARTEX_OUTPUT="${ARTEX_OUTPUT:-dist/artex-${ARTEX_TARGET_OS}-${ARTEX_TARGET_ARCH}/${ARTEX_BINARY_NAME}}"
+
+info "构建前端静态资源"
+if [ "${ARTEX_SKIP_NPM_CI:-0}" != "1" ]; then
+  (cd web && npm ci)
+fi
+(cd web && npm run build:static)
+
+info "同步前端资源到 server/webui/dist"
+mkdir -p server/webui/dist
+rsync -a --delete web/out/ server/webui/dist/
+
+info "编译 ${ARTEX_TARGET_OS}/${ARTEX_TARGET_ARCH}，版本 ${ARTEX_BUILD_VERSION}"
+mkdir -p "$(dirname "$ARTEX_OUTPUT")"
+GOSUMDB="$ARTEX_GOSUMDB" \
+CGO_ENABLED=0 \
+GOOS="$ARTEX_TARGET_OS" \
+GOARCH="$ARTEX_TARGET_ARCH" \
+go build \
+  -tags embedui \
+  -trimpath \
+  -ldflags "-s -w -X main.version=${ARTEX_BUILD_VERSION}" \
+  -o "$ARTEX_OUTPUT" \
+  ./cmd/artex
+
+ok "编译完成：$ARTEX_OUTPUT"
+if command -v file >/dev/null 2>&1; then
+  file "$ARTEX_OUTPUT"
+fi