Reflect 3 session logs into topic memory files

New: gotchas-skills.md (non-ASCII frontmatter, per-profile skill dirs).
Updated: gotchas-bash.md (+((var++)) with zero), decisions.md (+python3
for JSON), process-lessons.md (+cat -A diagnostic).

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

memory/process-lessons.md

@@ -8,6 +8,10 @@ Debugging `set -e` failures in scripts that aggregate data from multiple sources
 
 The spec → implement → test workflow caught real bugs during development (grep flag parsing, `local` keyword misuse, binary detection false positives). Writing tests that exercise dryrun against spec expectations is an effective pattern for this project.
 
+## Use `cat -A` to diagnose invisible character issues
+
+When a file looks correct but tooling rejects it, `cat -A` reveals non-printing characters (e.g., `M-bM-^@M-^T` for em dashes that appear identical to regular dashes). Essential for debugging YAML frontmatter, config files, and any context where encoding matters.
+
 ## Use `git diff --numstat` for binary detection instead of `file`
 
 The `file` command is unreliable for distinguishing binary from text files (marks shell scripts as "executable"). `git diff --numstat` shows `-` for binary files and is more reliable since git already has its own binary detection heuristics.