diff --git a/dev/ACTIVE_TASK.json b/dev/ACTIVE_TASK.json
index 195572d..40456eb 100644
--- a/dev/ACTIVE_TASK.json
+++ b/dev/ACTIVE_TASK.json
@@ -1,5 +1,5 @@
 {
-  "task_file": "dev/tasks/DEV-000113-model-qualification-gate.json",
-  "task_id": "DEV-000113",
+  "task_file": "dev/tasks/DEV-000114-run-liveness-assessment.json",
+  "task_id": "DEV-000114",
   "task_revision": 1
 }
diff --git a/dev/tasks/DEV-000114-run-liveness-assessment.json b/dev/tasks/DEV-000114-run-liveness-assessment.json
new file mode 100644
index 0000000..9fb4ba7
--- /dev/null
+++ b/dev/tasks/DEV-000114-run-liveness-assessment.json
@@ -0,0 +1,23 @@
+{
+  "task_id": "DEV-000114",
+  "task_revision": 1,
+  "architecture_revision": "ADR-0018",
+  "base_repo_revision": "a65ee37",
+  "risk_tier": "E",
+  "intent": "Add deterministic AgentRun liveness assessment for stale-run recovery without requeueing or mutating production records.",
+  "requirement_ids": ["WP-302", "Heartbeat timeout", "Typed stale evidence"],
+  "allowed_change_scope": {"modules": ["work-recovery"], "paths": ["modules/work/domain/**", "contracts/work/**", "tests/work_recovery/**", "dev/ACTIVE_TASK.json", "dev/tasks/DEV-000114-run-liveness-assessment.json"]},
+  "forbidden_change_scope": {"paths": ["architecture/**", "database/**", "migrations/**", "deploy/**", "security/**", "cmd/**", "runtime/**", "adapters/**", ".gitea/**"]},
+  "allowed_architecture_delta": {"new_cross_module_dependencies": 0, "new_canonical_owners": 0, "new_privileges": 0, "new_third_party_dependencies": 0, "new_database_owner_roles": 0},
+  "contracts": {"consume": ["Existing Work AgentRun lifecycle", "ADR-0017 delegation ownership"], "may_change": ["Work recovery liveness projection"]},
+  "semantic_owner": "work-recovery",
+  "canonical_state": [],
+  "state_transitions": ["run timestamp evidence -> LIVE/STALE/INVALID", "stale evidence -> recovery decision pending"],
+  "side_effects_and_privileges": ["Pure assessment; no requeue, resume, cancellation, persistence or external mutation"],
+  "persistence_and_migrations": ["No schema or migration changes"],
+  "failure_retry_restart": ["Clock/invalid timestamps produce INVALID rather than stale or healthy"],
+  "assumptions": ["UpdatedAt is the latest durable heartbeat/checkpoint projection available", "Recovery policy chooses the next action separately", "RUNNING alone is not proof of liveness"],
+  "acceptance_scenarios": ["Recent run is LIVE", "Old running run is STALE with age", "Completed/blocked run is not stale", "Invalid clock/timestamp is INVALID", "No production state changes"],
+  "required_tests": ["go test ./...", "go vet ./...", "go run ./cmd/devctl preflight -active dev/ACTIVE_TASK.json", "go run ./cmd/devctl check-diff -active dev/ACTIVE_TASK.json", "go run ./cmd/devctl check-architecture", "go run ./cmd/devctl/independent", "git diff --check", "run liveness tests"],
+  "terminal_gap_states": ["BLOCKED_BY_MISSING_CAPABILITY", "BLOCKED_BY_SPEC_GAP", "BLOCKED_BY_CONFLICT"]
+}
diff --git a/modules/work/domain/liveness.go b/modules/work/domain/liveness.go
new file mode 100644
index 0000000..1e24466
--- /dev/null
+++ b/modules/work/domain/liveness.go
@@ -0,0 +1,45 @@
+package domain
+
+import (
+	"time"
+
+	"git.cin.su/m/Assistant/contracts/work"
+)
+
+type RunLivenessState string
+
+const (
+	RunLivenessLive    RunLivenessState = "LIVE"
+	RunLivenessStale   RunLivenessState = "STALE"
+	RunLivenessInvalid RunLivenessState = "INVALID"
+	RunLivenessNotRun  RunLivenessState = "NOT_RUNNING"
+)
+
+type RunLiveness struct {
+	State      RunLivenessState
+	Age        time.Duration
+	ObservedAt time.Time
+}
+
+func AssessRunLiveness(run work.AgentRun, observedAt time.Time, heartbeatTimeout time.Duration) RunLiveness {
+	result := RunLiveness{ObservedAt: observedAt}
+	if observedAt.IsZero() || heartbeatTimeout <= 0 || run.UpdatedAtUnixMillis < 1 {
+		result.State = RunLivenessInvalid
+		return result
+	}
+	if run.State != work.AgentRunStarted && run.State != work.AgentRunRunning {
+		result.State = RunLivenessNotRun
+		return result
+	}
+	updated := time.UnixMilli(run.UpdatedAtUnixMillis)
+	result.Age = observedAt.Sub(updated)
+	if result.Age < 0 {
+		result.State = RunLivenessInvalid
+		return result
+	}
+	result.State = RunLivenessLive
+	if result.Age > heartbeatTimeout {
+		result.State = RunLivenessStale
+	}
+	return result
+}
diff --git a/tests/work_recovery/liveness_test.go b/tests/work_recovery/liveness_test.go
new file mode 100644
index 0000000..783ece4
--- /dev/null
+++ b/tests/work_recovery/liveness_test.go
@@ -0,0 +1,33 @@
+package work_recovery_test
+
+import (
+	"testing"
+	"time"
+
+	"git.cin.su/m/Assistant/contracts/work"
+	workdomain "git.cin.su/m/Assistant/modules/work/domain"
+)
+
+func TestAssessRunLivenessClassifiesDurableHeartbeat(t *testing.T) {
+	now := time.UnixMilli(10000)
+	run := work.AgentRun{ID: "run-1", DelegationID: "delegation-1", ImplementationID: "agent-1", ImplementationRevision: 1, Protocol: work.AgentExecutionProtocol("v1"), State: work.AgentRunRunning, StartedAtUnixMillis: 9000, UpdatedAtUnixMillis: 9000}
+	if got := workdomain.AssessRunLiveness(run, now.Add(100*time.Millisecond), time.Second); got.State != workdomain.RunLivenessStale || got.Age != 1100*time.Millisecond {
+		t.Fatalf("stale = %#v", got)
+	}
+	run.UpdatedAtUnixMillis = 9500
+	if got := workdomain.AssessRunLiveness(run, now, time.Second); got.State != workdomain.RunLivenessLive {
+		t.Fatalf("live = %#v", got)
+	}
+}
+
+func TestAssessRunLivenessDoesNotTreatCompletedAsStale(t *testing.T) {
+	run := work.AgentRun{State: work.AgentRunCompleted, UpdatedAtUnixMillis: 1}
+	got := workdomain.AssessRunLiveness(run, time.UnixMilli(10000), time.Second)
+	if got.State != workdomain.RunLivenessNotRun {
+		t.Fatalf("completed = %#v", got)
+	}
+	invalid := workdomain.AssessRunLiveness(run, time.Time{}, time.Second)
+	if invalid.State != workdomain.RunLivenessInvalid {
+		t.Fatalf("invalid = %#v", invalid)
+	}
+}