test: add bats test suite for lib/ helper scripts

110 tests across 10 test files covering all lib/ scripts:
- archeflow-event.sh: JSONL format, seq numbering, parent fields, validation
- archeflow-memory.sh: add/list/decay/forget/inject/extract commands
- archeflow-git.sh: branch creation, commit format, merge strategies, safety
- archeflow-report.sh: markdown output, summary mode, in-progress handling
- archeflow-progress.sh: progress.md generation, JSON mode, error handling
- archeflow-score.sh: archetype scoring, effectiveness report, validation
- archeflow-dag.sh: DAG rendering, color flags, tree structure
- archeflow-rollback.sh: arg parsing, phase validation, mutual exclusivity
- archeflow-init.sh: template listing, clone from project, arg validation
- archeflow-review.sh: diff modes, stats, branch/commit range review

Includes test_helper.bash (shared setup/teardown with temp git repos)
and scripts/run-tests.sh runner.

tests/archeflow-event.bats

@@ -0,0 +1,127 @@
+# Tests for archeflow-event.sh — structured JSONL event logging.
+#
+# Validates: JSONL output format, sequence numbering, parent field handling,
+# input validation, file/directory creation.
+
+setup() {
+  load test_helper
+  _common_setup
+}
+
+teardown() {
+  _common_teardown
+}
+
+@test "event: exits 1 with usage when called with fewer than 4 args" {
+  run "$LIB_DIR/archeflow-event.sh" run1 type1 plan
+  [ "$status" -eq 1 ]
+  [[ "$output" == *"Usage"* ]]
+}
+
+@test "event: creates events directory and file on first call" {
+  run "$LIB_DIR/archeflow-event.sh" test-run run.start plan "" '{"task":"test"}'
+  [ "$status" -eq 0 ]
+  [ -d ".archeflow/events" ]
+  [ -f ".archeflow/events/test-run.jsonl" ]
+}
+
+@test "event: first event has seq=1" {
+  run "$LIB_DIR/archeflow-event.sh" test-run run.start plan "" '{"task":"test"}'
+  [ "$status" -eq 0 ]
+  local seq
+  seq=$(head -1 ".archeflow/events/test-run.jsonl" | jq -r '.seq')
+  [ "$seq" -eq 1 ]
+}
+
+@test "event: second event has seq=2" {
+  "$LIB_DIR/archeflow-event.sh" test-run run.start plan "" '{"task":"test"}' 2>/dev/null
+  "$LIB_DIR/archeflow-event.sh" test-run agent.complete plan creator '{"dur":100}' "1" 2>/dev/null
+  local count
+  count=$(wc -l < ".archeflow/events/test-run.jsonl")
+  [ "$count" -eq 2 ]
+  local seq2
+  seq2=$(tail -1 ".archeflow/events/test-run.jsonl" | jq -r '.seq')
+  [ "$seq2" -eq 2 ]
+}
+
+@test "event: output is valid JSONL" {
+  "$LIB_DIR/archeflow-event.sh" test-run run.start plan "" '{"task":"hello"}' 2>/dev/null
+  # jq will fail if the line is not valid JSON
+  jq empty ".archeflow/events/test-run.jsonl"
+}
+
+@test "event: fields are correctly populated" {
+  "$LIB_DIR/archeflow-event.sh" test-run agent.complete do maker '{"tokens":500}' 2>/dev/null
+  local event
+  event=$(head -1 ".archeflow/events/test-run.jsonl")
+  [ "$(echo "$event" | jq -r '.run_id')" = "test-run" ]
+  [ "$(echo "$event" | jq -r '.type')" = "agent.complete" ]
+  [ "$(echo "$event" | jq -r '.phase')" = "do" ]
+  [ "$(echo "$event" | jq -r '.agent')" = "maker" ]
+  [ "$(echo "$event" | jq -r '.data.tokens')" = "500" ]
+}
+
+@test "event: empty agent becomes null in JSON" {
+  "$LIB_DIR/archeflow-event.sh" test-run phase.transition do "" '{"from":"plan","to":"do"}' 2>/dev/null
+  local agent
+  agent=$(head -1 ".archeflow/events/test-run.jsonl" | jq -r '.agent')
+  [ "$agent" = "null" ]
+}
+
+@test "event: parent field is empty array for root events" {
+  "$LIB_DIR/archeflow-event.sh" test-run run.start plan "" '{}' 2>/dev/null
+  local parent
+  parent=$(head -1 ".archeflow/events/test-run.jsonl" | jq -c '.parent')
+  [ "$parent" = "[]" ]
+}
+
+@test "event: single parent is parsed correctly" {
+  "$LIB_DIR/archeflow-event.sh" test-run run.start plan "" '{}' 2>/dev/null
+  "$LIB_DIR/archeflow-event.sh" test-run agent.complete plan creator '{}' "1" 2>/dev/null
+  local parent
+  parent=$(tail -1 ".archeflow/events/test-run.jsonl" | jq -c '.parent')
+  [ "$parent" = "[1]" ]
+}
+
+@test "event: multiple parents (fan-in) are parsed correctly" {
+  "$LIB_DIR/archeflow-event.sh" test-run run.start plan "" '{}' 2>/dev/null
+  "$LIB_DIR/archeflow-event.sh" test-run a plan "" '{}' "1" 2>/dev/null
+  "$LIB_DIR/archeflow-event.sh" test-run b plan "" '{}' "1" 2>/dev/null
+  "$LIB_DIR/archeflow-event.sh" test-run merge plan "" '{}' "2,3" 2>/dev/null
+  local parent
+  parent=$(tail -1 ".archeflow/events/test-run.jsonl" | jq -c '.parent')
+  [ "$parent" = "[2,3]" ]
+}
+
+@test "event: rejects invalid JSON data" {
+  run "$LIB_DIR/archeflow-event.sh" test-run run.start plan "" 'not-json'
+  [ "$status" -eq 1 ]
+  [[ "$output" == *"invalid JSON"* ]]
+}
+
+@test "event: rejects invalid parent format" {
+  run "$LIB_DIR/archeflow-event.sh" test-run run.start plan "" '{}' "abc"
+  [ "$status" -eq 1 ]
+  [[ "$output" == *"invalid parent format"* ]]
+}
+
+@test "event: timestamp is ISO 8601 UTC format" {
+  "$LIB_DIR/archeflow-event.sh" test-run run.start plan "" '{}' 2>/dev/null
+  local ts
+  ts=$(head -1 ".archeflow/events/test-run.jsonl" | jq -r '.ts')
+  # Matches YYYY-MM-DDTHH:MM:SSZ
+  [[ "$ts" =~ ^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}Z$ ]]
+}
+
+@test "event: default data is empty object when omitted" {
+  "$LIB_DIR/archeflow-event.sh" test-run run.start plan agent 2>/dev/null
+  local data
+  data=$(head -1 ".archeflow/events/test-run.jsonl" | jq -c '.data')
+  [ "$data" = "{}" ]
+}
+
+@test "event: confirmation message goes to stderr" {
+  run "$LIB_DIR/archeflow-event.sh" test-run run.start plan "" '{}' "" 2>&1
+  [[ "$output" == *"[archeflow-event]"* ]]
+  [[ "$output" == *"#1"* ]]
+}