Add memory files, reflection state, and update docs

Memory files for decisions, bash gotchas, and process lessons.
Updated MEMORY.md index and README.md with new scripts.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

MEMORY.md

@@ -1,3 +1,12 @@
 # Memory Index
 
 <!-- Thin index only — one-line descriptions linking to memory/ topic files -->
+
+## Gotchas
+- [Bash Gotchas](memory/gotchas-bash.md) — `set -e` silent failures, grep flag parsing, `local` scope, binary detection with `file` command
+
+## Decisions
+- [Decisions](memory/decisions.md) — OpenSpec format, mandatory dryrun, `set -uo pipefail` policy, dirty-state definitions, skynet org hosting
+
+## Process
+- [Process Lessons](memory/process-lessons.md) — Skip `set -e` for reporting tools, spec-driven testing effectiveness, `git diff --numstat` for binary detection