revert: remove coverage hooks feature that causes CI hangs

The coverage tracking in lifecycle hooks feature causes parallel
test runs to hang indefinitely in GitHub Actions CI.

This reverts all changes from PR #574 until the root cause of
the parallel test hangs can be identified and fixed.

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

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: Chemaclass

src/coverage.sh

@@ -95,7 +95,7 @@ function bashunit::coverage::enable_trap() {
   # Set DEBUG trap to record line execution
   # Use ${VAR:-} to handle unset variables when set -u is active (in subshells)
   # shellcheck disable=SC2154
-  trap 'bashunit::coverage::record_line "${BASH_SOURCE[0]:-}" "${LINENO:-}"' DEBUG
+  trap 'bashunit::coverage::record_line "${BASH_SOURCE:-}" "${LINENO:-}"' DEBUG
 }
 
 function bashunit::coverage::disable_trap() {

src/runner.sh

@@ -23,10 +23,6 @@ function bashunit::runner::load_test_files() {
     # Auto-discover coverage paths if not explicitly set
     if [[ -z "$BASHUNIT_COVERAGE_PATHS" ]]; then
       BASHUNIT_COVERAGE_PATHS=$(bashunit::coverage::auto_discover_paths "${files[@]}")
-      # Fallback: if auto-discovery yields no paths, track the src/ folder
-      if [[ -z "$BASHUNIT_COVERAGE_PATHS" ]]; then
-        BASHUNIT_COVERAGE_PATHS="src/"
-      fi
     fi
     bashunit::coverage::init
   fi
@@ -854,16 +850,8 @@ function bashunit::runner::execute_file_hook() {
   trap '_BASHUNIT_HOOK_ERR_STATUS=$?; set +eE; trap - ERR; return $_BASHUNIT_HOOK_ERR_STATUS' ERR
 
   {
-    # Enable coverage trap inside hooks to attribute lines executed during setup/teardown
-    if bashunit::env::is_coverage_enabled; then
-      bashunit::coverage::enable_trap
-    fi
     "$hook_name"
   } >"$hook_output_file" 2>&1
-  # Disable coverage trap after hook execution
-  if bashunit::env::is_coverage_enabled; then
-    bashunit::coverage::disable_trap
-  fi
 
   # Capture exit status from global variable and clean up
   status=$_BASHUNIT_HOOK_ERR_STATUS
@@ -955,16 +943,8 @@ function bashunit::runner::execute_test_hook() {
   trap '_BASHUNIT_HOOK_ERR_STATUS=$?; set +eE; trap - ERR; return $_BASHUNIT_HOOK_ERR_STATUS' ERR
 
   {
-    # Enable coverage trap inside test-level hooks
-    if bashunit::env::is_coverage_enabled; then
-      bashunit::coverage::enable_trap
-    fi
     "$hook_name"
   } >"$hook_output_file" 2>&1
-  # Disable coverage trap after hook execution
-  if bashunit::env::is_coverage_enabled; then
-    bashunit::coverage::disable_trap
-  fi
 
   # Capture exit status from global variable and clean up
   status=$_BASHUNIT_HOOK_ERR_STATUS