Backfill memory files for all existing scripts and skills

Creates MEMORY.md index and 10 memory files documenting:
- Scripts: context-load, start-claude, install-hooks, setup-formatters, git-status-report
- Skills: /log, /reflect-logs, /reflect, /distill-best-practices, /linter

Each file covers purpose, usage, how it works, and gotchas.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

memory/skill-log.md

@@ -0,0 +1,33 @@
+# skill: /log
+
+**Location:** `custom-claude-skills/skills/log/SKILL.md`
+
+## Purpose
+
+End-of-session logging. Captures key decisions, gotchas, open questions, and process notes into `memory/log/YYYY-MM-DD.<HHMMSS>.md` for later reflection. Run before ending a session.
+
+## Usage
+
+```
+/log
+```
+
+No arguments. Reviews the full conversation history automatically.
+
+## How it works
+
+1. Creates `memory/log/` if needed
+2. Reviews the conversation and extracts: Summary, Decisions, Gotchas (tagged with `[topic]`), Open Questions, Key Context, Process Notes
+3. Writes a structured log file — empty sections are omitted
+4. Prunes old logs: deletes reflected logs older than `retention_days` (default 7), warns about unreflected logs older than `warn_unreflected_days` (default 14)
+
+## Part of the knowledge pipeline
+
+`/log` → `/reflect-logs` → `/distill-best-practices`
+
+Raw session logs are input for `/reflect-logs`, which routes entries into topic memory files.
+
+## Gotchas
+
+- Trivial sessions can be skipped — the skill says so if nothing worth logging happened
+- `[topic]` tags on gotchas should match existing memory file topics for routing by `/reflect-logs`