feat(skills): add /pf-log-reading and /pf-log-session slash commands

paperforge/command_files/pf-log-reading.md

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+# /pf-log-reading — Record a reading note
+
+> 读完当前段落或章节后自动记录到 paperforge.db 的 paper_events 表。
+
+## Agent Workflow
+
+1. 确定 zotero_key (从上下文或 formal note 中获取)
+2. 提取以下信息:
+   - **section**: 文献中的位置 (e.g. "Discussion P12", "Results Fig.3")
+   - **excerpt**: 逐字引用的原文关键句
+   - **usage**: 这个信息支持当前写作的哪个论点
+   - **note**: 任何交叉验证/矛盾/注意事项 (optional)
+
+3. 执行:
+```bash
+paperforge reading-log --write <KEY> \
+    --section "Discussion P12" \
+    --excerpt "the fundamental disjunction between materials science and biology" \
+    --usage "F 段 gap 论点" \
+    --note "与 DDGMQ7RW 独立诊断同一问题"
+```
+
+## Prompt Injection
+
+After reading a section or paragraph from a paper:
+
+**Record a reading note.** Determine the zotero_key of the paper you just read. Extract the section name (e.g. "Discussion P12", "Results Fig.3"), a verbatim excerpt of the key sentence, how this supports the current writing task, and any cross-validation notes. Then run:
+
+```
+paperforge --vault {vault_path} reading-log --write KEY --section "..." --excerpt "..." --usage "..." --note "..."
+```
+
+If the user's vault path is unknown, ask before running.

paperforge/command_files/pf-log-session.md

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+# /pf-log-session — Summarize session decisions to working-log
+
+> 会话结束时回顾本次所有决策节点，追加到 working-log.md。
+
+## Agent Workflow
+
+1. 回顾本次会话中所有关键节点:
+   - 用户纠正了什么
+   - 方案怎么变的
+   - 有什么弯路和教训
+   - 可复用的方法论
+
+2. 按以下格式生成 markdown，追加到 working-log.md:
+
+```markdown
+## <YYYY-MM-DD> — <小节名>
+
+### 核心决策
+- 做了什么、为什么
+
+### 弯路与修正
+- 错误方向 → 用户纠正 → 最终方案
+
+### 可复用方法论
+- 本段的 pattern，后续段落能怎么用
+
+### 待办
+- [ ] ...
+```
+
+3. 询问用户确认，然后写入到 `Project/<project>/working-log.md`
+
+## Prompt Injection
+
+At the end of this session, before saying goodbye:
+
+**Write the working-log entry.** Review all decision points, corrections, dead ends, and methodological insights from this session. Ask the user: "Should I write the working-log entry now?" If yes, generate the entry in the format below and append it to the appropriate working-log.md in the user's project directory. Ask the user to confirm the project path if unsure.
+
+Format:
+```
+## YYYY-MM-DD — Section Name
+
+### Core Decisions
+- What happened and why
+
+### Dead Ends & Corrections
+- Wrong direction -> User correction -> Final approach
+
+### Reusable Methodology
+- Patterns that apply to later sections
+
+### TODO
+- [ ] ...
+```