fix(ralph-wiggum): fix shellcheck error and add comprehensive tests

Bug fix:
- Fixed multiple stderr redirections in stop-hook.sh:140
- Changed `&& \` chain to proper if-statement

Tests:
- Added 10 new bats tests (21 total)
- Cross-platform hash function tests (_hash)
- API limit handler tests (rate limit detection, wait time)
- All 21 tests passing

Code quality:
- Ran shellcheck on all scripts - zero errors
- Updated iteration log

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Co-Authored-By: duyetbot <duyetbot@users.noreply.github.com>

Author: 3 people

.claude/iteration-log.md

@@ -1,6 +1,35 @@
 # Iteration Log
 
-## Iteration 3 (Current)
+## Iteration 4 (Current)
+
+### What Was Done
+1. **Extended Test Coverage**
+   - Added 10 new bats tests (21 total, up from 11)
+   - New tests for cross-platform hash function (`_hash`)
+   - New tests for api_limit_handler (rate limit detection, wait time calculation)
+   - All 21 tests passing
+
+2. **Bug Fix**
+   - Fixed shellcheck error in `stop-hook.sh` line 140
+   - Issue: Multiple stderr redirections competing (`&>/dev/null 2>/dev/null`)
+   - Fixed by using proper if-statement instead of `&&` chain
+
+3. **Code Quality**
+   - Ran shellcheck on all scripts
+   - Zero errors (only style warnings about `local` declarations)
+
+### What Was Found
+- All scripts pass shellcheck with no errors
+- Test coverage is comprehensive for core functionality
+- Documentation is complete for all plugins
+
+### What Needs To Be Done Next
+- Documentation and scripts are in good shape
+- Consider this iteration complete pending user feedback
+
+---
+
+## Iteration 3
 
 ### What Was Done
 1. **Plugin Documentation Updates**
@@ -22,11 +51,6 @@
 - Documentation is now consistent across all plugins
 - All major plugins have Installation, Usage, and Architecture sections
 
-### What Needs To Be Done Next
-1. Add more bats tests for cross-platform hash function
-2. Consider adding CHANGELOG.md for version tracking
-3. Final review pass for any remaining issues
-
 ---
 
 ## Iteration 2

.claude/ralph-loop.local.md

@@ -1,6 +1,6 @@
 ---
 active: true
-iteration: 2
+iteration: 3
 max_iterations: 0
 completion_promise: null
 circuit_breaker: true

ralph-wiggum/hooks/stop-hook.sh

@@ -137,8 +137,9 @@ if [[ "$ENABLE_CIRCUIT_BREAKER" == "true" ]] && type can_execute &>/dev/null; th
   echo "$LAST_OUTPUT" | grep -qiE "error|failed|exception|traceback" && ERROR_DETECTED="error_in_output"
 
   FILES_CHANGED=0
-  command -v git &>/dev/null && git rev-parse --git-dir &>/dev/null 2>/dev/null && \
+  if command -v git &>/dev/null && git rev-parse --git-dir &>/dev/null; then
     FILES_CHANGED=$(git diff --name-only 2>/dev/null | wc -l | tr -d ' ')
+  fi
 
   NEW_STATE=$(record_loop_result "$LAST_OUTPUT" "$ERROR_DETECTED" "$FILES_CHANGED")
 

tests/ralph-wiggum.bats

@@ -9,12 +9,39 @@ setup() {
   # Source the lib scripts
   source "$BATS_TEST_DIRNAME/../ralph-wiggum/lib/response_analyzer.sh"
   source "$BATS_TEST_DIRNAME/../ralph-wiggum/lib/circuit_breaker.sh"
+  source "$BATS_TEST_DIRNAME/../ralph-wiggum/lib/api_limit_handler.sh"
 }
 
 teardown() {
   rm -rf "$RALPH_STATE_DIR"
 }
 
+# Cross-Platform Hash Function Tests
+
+@test "hash: _hash function exists and is callable" {
+  run bash -c 'echo "test" | _hash'
+  [[ "$status" -eq 0 ]]
+  [[ -n "$output" ]]
+}
+
+@test "hash: _hash produces consistent output" {
+  hash1=$(echo "hello world" | _hash)
+  hash2=$(echo "hello world" | _hash)
+  [[ "$hash1" == "$hash2" ]]
+}
+
+@test "hash: _hash produces different output for different input" {
+  hash1=$(echo "hello" | _hash)
+  hash2=$(echo "world" | _hash)
+  [[ "$hash1" != "$hash2" ]]
+}
+
+@test "hash: calculate_output_hash works" {
+  result=$(calculate_output_hash "test string")
+  [[ -n "$result" ]]
+  [[ "$result" != "no_output" ]]
+}
+
 # Response Analyzer Tests
 
 @test "response_analyzer: init creates state file" {
@@ -79,3 +106,38 @@ teardown() {
   state=$(get_circuit_state)
   [[ "$state" == "CLOSED" ]]
 }
+
+# API Limit Handler Tests
+
+@test "api_limit_handler: init creates state file" {
+  init_limit_handler
+  [[ -f "$RALPH_STATE_DIR/ralph-limits.json" ]]
+}
+
+@test "api_limit_handler: detect rate limit identifies 429" {
+  result=$(detect_rate_limit "Error: 429 Too Many Requests")
+  [[ "$result" == "true" ]]
+}
+
+@test "api_limit_handler: detect rate limit identifies rate limit text" {
+  result=$(detect_rate_limit "You have hit the rate limit")
+  [[ "$result" == "true" ]]
+}
+
+@test "api_limit_handler: detect rate limit returns false for normal text" {
+  result=$(detect_rate_limit "Everything is working fine")
+  [[ "$result" == "false" ]]
+}
+
+@test "api_limit_handler: determine limit type identifies 5-hour limit" {
+  result=$(determine_limit_type "You have exceeded your 5-hour usage limit")
+  [[ "$result" == "5_hour_limit" ]]
+}
+
+@test "api_limit_handler: calculate wait time returns correct seconds" {
+  result=$(calculate_wait_time "5_hour_limit")
+  [[ "$result" == "3600" ]]
+
+  result=$(calculate_wait_time "rate_limit")
+  [[ "$result" == "60" ]]
+}