Fix stale Gitea host and record access facts in AGENTS.md

Why: the TASK_CARD_WEB_BASE default in scripts/task.sh still pointed at
git-panel.u1680832.nyat.app:30319, which now fails the TLS handshake
(curl exit 35), breaking card-close PR links and API calls; agents also
kept rediscovering hosts and credential locations from scratch each
session.

Evidence: curl https://git-panel...:30319/api/v1/version -> exit 35; curl
https://git-home...:30319/api/v1/version with token from ~/.secrets/gitea
-> {"version":"1.27.3"}; ssh -p 31411 git@git-ssh... -> 'Hi there,
weichen!' with key ~/.ssh/home_gitea (ED25519, fingerprint
SHA256:GYXaOXIMeloQ1fKSfdJ/ndgPQzs/Ix7Hk62ekfkfQ20, key name GMKtec).

Impact: task.sh default web base now resolves to the live host; AGENTS.md
gains a Gitea access-facts section recording hosts plus credential
locations only (no secret values, per baseline hard boundary 2). Follow-up
PRs propagate the same section to the other project repos.

Refs: task card feature-gitea-access-facts

scripts/task.sh

@@ -171,8 +171,9 @@ cmd_close() {
   local fold=0
   [ "${1:-}" = "--fold" ] && fold=1
   git fetch -q origin "${TARGET_BRANCH}" 2>/dev/null || true
-  # 默认值取远端通告的 Web 面（git push 输出的 PR 建议链接）；可用 TASK_CARD_WEB_BASE 覆盖
-  local web_base="${TASK_CARD_WEB_BASE:-https://git-panel.u1680832.nyat.app:30319}"
+  # 默认值取远端通告的 Web 面（git push 输出的 PR 建议链接）；可用 TASK_CARD_WEB_BASE 覆盖。
+  # git-panel 前缀已失效（TLS 握手失败），默认值改为实测可用的 git-home（AGENTS.md 访问事实节）。
+  local web_base="${TASK_CARD_WEB_BASE:-https://git-home.u1680832.nyat.app:30319}"
   local url owner repo
   url=$(git remote get-url origin); url="${url%.git}"
   repo=$(basename "$url"); owner=$(basename "$(dirname "$url")")