Add AI session memory (absorbed from obsidian-knowledge-brain v4.0)

.claude/memory/decisions.md

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+# 🦚 Decisions / 定案 ➜ final adopted solutions, don't re-discuss
+
+```
+format (one entry ≤ 6 lines):
+
+## [scope] short title
+    decision:  what adopted
+    why:       key reason
+    date:      yyyy-mm
+```
+
+
+## [lab.vpn] wireguard + netmaker
+    decision:  vpn use wireguard, manage by netmaker
+    why:       simple + fast, see card LAB.Net.VPN.Choose
+    date:      old
+
+
+## [rv.ha] home assistant use supervised on rpi4 ubuntu22
+    decision:  ha os choose supervised, not haos/container
+    why:       need host os control + addons both
+    date:      old
+
+
+## [rv.solar] panels connect parallel not series
+    decision:  solar panel parallel connect
+    why:       one panel broken ➜ no affect whole system
+    date:      old
+
+
+## [ai.memory] absorb obsidian-knowledge-brain ideas, not whole skill
+    decision:  lightweight CLAUDE.md + .claude/memory/ only
+    why:       v4.0 full skill = 20 scripts + bootstrap, too heavy for vault repo
+    date:      2026-07

.claude/memory/pitfalls.md

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+# 🦚 Pitfalls / 坑 ➜ fixed bugs, never step twice
+
+```
+format (one entry ≤ 6 lines):
+
+## [scope] short title
+    problem:  what broke
+    cause:    root cause
+    fix:      final fix
+    seen: 1   ➜ same pitfall again = seen+1, NO new entry
+```
+
+
+## [net.vxlan] ros + fgt vxlan port mismatch
+    problem:  mikrotik ↔ fortigate vxlan not talk
+    cause:    default port diff ➜ ros.8472, fgt.4789
+    fix:      change ros vxlan & vtep port to 4789
+    seen: 1
+
+
+## [rpi.nic] startech dual-usb nic no balance-rr
+    problem:  rpi nic bond balance-rr not work
+    cause:    startech dual-usb nic not support balance-rr
+    fix:      use 802.3ad bond instead
+    seen: 1
+
+
+## [rv.power] bmv-712 battery monitor not accurate
+    problem:  capacity reading crazy, setting crazy
+    cause:    device design, not config error
+    fix:      tell capacity by voltage table, skip bmv-712
+    seen: 1

CLAUDE.md

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+# 🦚 CLAUDE.md ➜ AI Session Memory / AI 会话记忆
+
+```
+🟢 Why
+
+    every ai session forget everything when it end
+    this file + .claude/memory/ make ai remember
+
+    每次 AI 会话结束就失忆 ➜ 用这套文件让它跨会话记住
+```
+
+
+## 🟢 Repo Is What
+
+```
+this repo = obsidian card vault ➜ homelab + rv + it knowledge
+
+    Readme.md   ➜ cards link center
+    Cards-AIO   ➜ cards real path
+    ◼︎X-xxx     ➜ notes need organize
+    .claude/    ➜ ai memory (this system)
+
+card name format:
+    🧬0️⃣0️⃣0️⃣0️⃣-A0z9 🐬 A.B.C ➜ xxxx
+    Level_1 + Level_2 + Category-Icon + Category-Abbr + Card Name
+
+status icon:
+    ✔️ done    ✅ verified    💯 best    🐶 draft    ✖️ todo    ❌ no/fail
+    ❗️ warning ➜ important warning repeat 3 times in code block
+```
+
+
+## 🟢 Session Start / 会话开始
+
+```
+1. read .claude/memory/pitfalls.md   ➜ known pitfalls, don't step twice
+2. read .claude/memory/decisions.md  ➜ final decisions, don't re-discuss
+3. then start work
+```
+
+
+## 🟢 Session Work / 会话中
+
+```
+fix a bug / find a pitfall  ➜ append to .claude/memory/pitfalls.md NOW (立刻记)
+make a final decision       ➜ remember it, write at session end (收尾时记)
+```
+
+
+## 🟢 Session End / 收尾
+
+```
+user say "收尾" or "wrap up" ➜ do this:
+
+1. extract final decisions from this session ➜ .claude/memory/decisions.md
+2. check pitfalls all recorded
+3. reply short summary: what recorded, what changed
+```
+
+
+## 🟢 Anti-Pollution Rules / 防污染 ❗️
+
+```
+❗️ only record FINAL adopted solutions. no exploring dead-ends ❗️
+❗️ same pitfall happen again ➜ seen+1 on old entry. NO new entry ❗️
+❗️ unresolved problem ➜ NOT record. stay in your head or todo ❗️
+
+keep entries short. one entry ≤ 6 lines.
+write style follow this vault: terse + code block + bilingual ok
+```
+
+
+## 🟢 Repo Edit Rules
+
+```
+- keep card name format 🧬 when create/rename cards
+- keep terse code-block style, don't rewrite user's notes into long prose
+- important warning ➜ ❗️ line repeat 3 times, same as vault style
+```