Add reflected memory files and update git-status-report

Adds gotchas-wezterm and updates gotchas-bash from recent reflections.
Prunes old reflected log. Updates MEMORY.md index.

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

memory/gotchas-bash.md

@@ -20,6 +20,10 @@ Using `local` in the main script body (e.g., inside a `for` loop that isn't wrap
 
 Arithmetic expressions like `((PASS++))` return the *pre-increment* value. When PASS=0, the result is 0 (falsy), which `set -e` treats as a failure and silently exits the script. Use `PASS=$((PASS + 1))` instead — assignments always succeed regardless of the computed value.
 
+## `set -e` in test harnesses aborts on expected failures
+
+Test scripts with `set -euo pipefail` silently abort when an assertion helper runs a command expected to fail (non-zero exit). The test runner exits before reporting results. Use `set -uo pipefail` (no `-e`) in test harness scripts and check exit codes explicitly in assertion functions.
+
 ## `file` command marks shell scripts as "executable"
 
 The `file` command returns strings like "Bourne-Again shell script, Unicode text, UTF-8 text executable" for shell scripts. Grepping for `executable` to detect binaries will false-positive on text scripts. Instead, grep for `binary|image|archive` and additionally check that the output does NOT contain `text`.

memory/gotchas-wezterm.md

@@ -0,0 +1,9 @@
+# WezTerm Gotchas
+
+## Flatpak-installed WezTerm CLI not in PATH
+
+`wezterm` CLI binary is not available in PATH when WezTerm is installed via Flatpak. Must invoke as `flatpak run org.wezfurlong.wezterm cli ...`. Scripts should auto-detect both native (`command -v wezterm`) and Flatpak installations.
+
+## Proportional split math for equal-sized panes
+
+To split a pane into N equal parts, each split i (0-indexed) uses `percent = (N-1-i)*100/(N-i)`. Example for 3 equal parts: first split at 66%, second at 50%. The `--horizontal` flag creates a column (pane to the right); `--bottom` creates a row (pane below). `wezterm cli split-pane` returns the new pane ID on stdout for subsequent splits.

memory/log/2026-03-13.111440.md

@@ -1,29 +0,0 @@
-# Session Log — 2026-03-13
-
-## Summary
-Created the `small-scripts` project — a spec-driven utility script collection with dryrun support and automated testing. Implemented the first script `git-status-report` which recursively scans directories for git repos and reports uncommitted changes with character-level diffs and remote sync status.
-
-## Decisions
-- Decision: Use OpenSpec format for all script specifications — Rationale: Testing agent-driven development; specs define purpose, usage, behaviour, dryrun behaviour, edge cases, and examples
-- Decision: Every script must support `--dryrun` / `-n` — Rationale: Enables testing via dryrun without side effects; tests validate spec compliance through dryrun output
-- Decision: Removed `set -e` from git-status-report, kept `set -uo pipefail` — Rationale: `set -e` caused silent failures in complex pipeline/subshell chains; for a reporting tool, explicit error handling is safer than errexit
-- Decision: "No remotes" and "detached HEAD" don't count as dirty — Rationale: These are informational states, not divergences; "(no remotes)" only shown when repo already has local changes
-- Decision: Project hosted under `skynet` org on Gitea — Rationale: AI-focused project (agent-driven development testbed)
-
-## Gotchas Discovered
-- **[bash]** Symptom: `set -euo pipefail` caused silent script termination with no output during complex loops with command substitutions and subshell calls — Fix: Removed `set -e`, kept `set -uo pipefail`. Reporting tools don't need errexit; explicit error handling is more predictable.
-- **[bash]** Symptom: `grep -qF "$expected"` interpreted `--dryrun` as a grep flag — Fix: Use `grep -qF -- "$expected"` to prevent option-like strings from being parsed as flags
-- **[bash]** Symptom: `local` keyword used outside a function in main loop body caused `local: can only be used in a function` error — Fix: Remove `local` qualifier for variables in the main script body
-- **[bash]** Symptom: `set -e` in test script killed execution when capturing output from commands expected to exit non-zero (`output=$(cmd)` where cmd exits 1) — Fix: Use `output=$(cmd) && rc=$? || rc=$?` or `output=$(cmd) || true` pattern
-- **[bash]** Symptom: `file` command on shell scripts returns "executable" which matched the binary detection grep `binary\|executable\|image\|archive` — Fix: Changed to `grep -qP "binary|image|archive"` with additional `! grep -q "text"` check to avoid false positives on text executables
-
-## Key Context
-- Project structure: `specs/` (OpenSpec), `scripts/` (implementations), `tests/` (test scripts using dryrun)
-- Scripts symlinked to `~/sbin` for PATH availability
-- Test runner at `tests/run-all.sh` with colour pass/fail output
-- First script `git-status-report` has 26 test assertions covering: help, no repos, dryrun, clean/dirty repos, untracked/deleted files, no remotes, ahead of remote, mixed repos, nested repo filtering, permission denied
-
-## Process Notes
-- The `set -e` debugging consumed significant time — the script worked in isolated tests but failed silently on real repos. Future scripts should start without `set -e` for reporting/read-only tools.
-- Test development caught real bugs (grep flag parsing, local keyword misuse) — the spec-driven approach with comprehensive tests works well.
-- The `file` command for binary detection is unreliable for scripts; need a better heuristic (maybe `git diff --numstat` which shows `-` for binary files).