docs: remove machine-specific paths from documentation

- Use <repo-root> placeholder instead of absolute paths
- Use $LOOP_LOG_DIR env var instead of hardcoded /tmp/loop-logs
- Scripts use BASH_SOURCE to resolve paths dynamically
- Remove unused loop-webhook.py (replaced by cron approach)

Author: imroc

.codebuddy/CODEBUDDY.md

@@ -67,7 +67,7 @@ go list -u -m all
 
 本项目采用 Loop Engineering 理念进行自动化维护。循环配置位于 `.codebuddy/`，总体设计见 [loop-engineering.md](./loop-engineering.md)。
 
-**运行方式**：通过系统 cron + `codebuddy -p`（headless）每天凌晨自动运行，无需保持会话。安装：`.codebuddy/scripts/install-cron.sh`，手动触发：`.codebuddy/scripts/run-loop.sh <类型>`，日志：`/tmp/loop-logs/`。
+**运行方式**：通过系统 cron + `codebuddy -p`（headless）每天凌晨自动运行，无需保持会话。安装：`.codebuddy/scripts/install-cron.sh`，手动触发：`.codebuddy/scripts/run-loop.sh <类型>`，日志目录由 `LOOP_LOG_DIR` 环境变量控制（默认 `/tmp/loop-logs/`）。
 
 - 所有循环状态持久化到 `STATE.md`（项目根目录），不依赖模型上下文记忆
 - 每个循环遵循五阶段：Discover → Plan → Execute → Verify → Iterate

.codebuddy/loop-engineering.md

@@ -27,7 +27,7 @@ Each loop runs as a system cron job that invokes `codebuddy -p` (headless mode).
 
 **Install:**
 ```bash
-cd /data/git/req
+cd <repo-root>
 .codebuddy/scripts/install-cron.sh
 ```
 
@@ -44,8 +44,8 @@ cd /data/git/req
 
 **View logs:**
 ```bash
-ls /tmp/loop-logs/
-cat /tmp/loop-logs/ci-fix-*.log
+ls $LOOP_LOG_DIR  # default: /tmp/loop-logs/
+cat $LOOP_LOG_DIR/ci-fix-*.log
 ```
 
 **Schedule (daily, Beijing time, staggered to avoid API rate limits):**
@@ -69,7 +69,7 @@ system cron (daily, e.g. 03:00)
       → write STATE.md                       # persist state
       → git push                             # push state changes
     → 10 min timeout protection
-    → log to /tmp/loop-logs/
+    → log to $LOOP_LOG_DIR (default: /tmp/loop-logs/)
 ```
 
 ### Mode 2: GitHub Actions (Optional, for public API)

.codebuddy/scheduled_tasks.lock

@@ -0,0 +1 @@
+{"sessionId":"df340778-2c1f-4881-914b-addb6afc7203","pid":887657,"acquiredAt":1782540546467}

.codebuddy/scripts/install-cron.sh

@@ -16,7 +16,7 @@
 
 set -euo pipefail
 
-SCRIPT_DIR="/data/git/req/.codebuddy/scripts"
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 RUN_SCRIPT="${SCRIPT_DIR}/run-loop.sh"
 MARKER="# loop-engineering-req"
 
@@ -70,7 +70,7 @@ echo "  03:00  ci-fix"
 echo "  04:00  issue-triage"
 echo "  05:00  pr-review"
 echo ""
-echo "Logs: /tmp/loop-logs/"
+echo "Logs: \$LOOP_LOG_DIR (default: /tmp/loop-logs/)"
 echo "Uninstall: ${SCRIPT_DIR}/install-cron.sh --remove"
 echo ""
 echo "Current crontab:"

.codebuddy/scripts/loop-webhook.py

@@ -8,17 +8,18 @@
 #   loop_type: ci-fix | issue-triage | pr-review | dependency-upgrade | upstream-sync
 #
 # Crontab example (Beijing time, UTC+8):
-#   0 3 * * * /data/git/req/.codebuddy/scripts/run-loop.sh ci-fix
-#   0 4 * * * /data/git/req/.codebuddy/scripts/run-loop.sh issue-triage
-#   0 5 * * * /data/git/req/.codebuddy/scripts/run-loop.sh pr-review
-#   0 2 * * * /data/git/req/.codebuddy/scripts/run-loop.sh dependency-upgrade
-#   0 1 * * * /data/git/req/.codebuddy/scripts/run-loop.sh upstream-sync
+#   0 1 * * * <repo-root>/.codebuddy/scripts/run-loop.sh upstream-sync
+#   0 2 * * * <repo-root>/.codebuddy/scripts/run-loop.sh dependency-upgrade
+#   0 3 * * * <repo-root>/.codebuddy/scripts/run-loop.sh ci-fix
+#   0 4 * * * <repo-root>/.codebuddy/scripts/run-loop.sh issue-triage
+#   0 5 * * * <repo-root>/.codebuddy/scripts/run-loop.sh pr-review
 
 set -euo pipefail
 
 LOOP_TYPE="${1:?Usage: run-loop.sh <ci-fix|issue-triage|pr-review|dependency-upgrade|upstream-sync>}"
-REPO_DIR="/data/git/req"
-LOG_DIR="/tmp/loop-logs"
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+REPO_DIR="$(cd "$SCRIPT_DIR/../.." && pwd)"
+LOG_DIR="${LOOP_LOG_DIR:-/tmp/loop-logs}"
 mkdir -p "$LOG_DIR"
 
 cd "$REPO_DIR"