diff --git a/contracts/epistemics/truth.go b/contracts/epistemics/truth.go
new file mode 100644
index 0000000..b597c61
--- /dev/null
+++ b/contracts/epistemics/truth.go
@@ -0,0 +1,38 @@
+package epistemics
+
+type BeliefState string
+
+const (
+	BeliefProvisional BeliefState = "PROVISIONAL"
+	BeliefConflicted  BeliefState = "CONFLICTED"
+	BeliefVerified    BeliefState = "VERIFIED"
+)
+
+type Observation struct {
+	ID             ObservationID
+	SourceSnapshot SourceSnapshotID
+	Excerpt        SourceExcerptID
+	Text           string
+	ObservedAt     int64
+}
+
+type Claim struct {
+	ID            ClaimID
+	Statement     string
+	ObservationID ObservationID
+	CitationID    CitationID
+	Verification  VerificationState
+}
+
+type Belief struct {
+	ID      BeliefID
+	ClaimID ClaimID
+	State   BeliefState
+}
+
+type TruthBundle struct {
+	Observation Observation
+	Claim       Claim
+	Belief      Belief
+	Citation    Citation
+}
diff --git a/dev/ACTIVE_TASK.json b/dev/ACTIVE_TASK.json
index 1d21d87..bd408de 100644
--- a/dev/ACTIVE_TASK.json
+++ b/dev/ACTIVE_TASK.json
@@ -1,5 +1,5 @@
 {
-  "task_file": "dev/tasks/DEV-000133-work-graph-persistence.json",
-  "task_id": "DEV-000133",
+  "task_file": "dev/tasks/DEV-000134-truth-bundle-compiler.json",
+  "task_id": "DEV-000134",
   "task_revision": 1
 }
diff --git a/dev/tasks/DEV-000134-truth-bundle-compiler.json b/dev/tasks/DEV-000134-truth-bundle-compiler.json
new file mode 100644
index 0000000..e97005c
--- /dev/null
+++ b/dev/tasks/DEV-000134-truth-bundle-compiler.json
@@ -0,0 +1,23 @@
+{
+  "task_id": "DEV-000134",
+  "task_revision": 1,
+  "architecture_revision": "ADR-0018",
+  "base_repo_revision": "e9bb42c",
+  "risk_tier": "E",
+  "intent": "Implement the first Truth runtime compiler that produces typed Observation, Claim, Belief and Citation values from an exact source chain.",
+  "requirement_ids": ["WP-100", "Observation/Claim/Belief", "Truth citation provenance"],
+  "allowed_change_scope": {"modules": ["epistemics"], "paths": ["contracts/epistemics/truth.go", "modules/epistemics/domain/truth.go", "tests/research_contracts/truth_bundle_test.go", "dev/ACTIVE_TASK.json", "dev/tasks/DEV-000134-truth-bundle-compiler.json"]},
+  "forbidden_change_scope": {"paths": ["architecture/**", "security/**", "deploy/**", "database/**", "adapters/**", "cmd/**", "runtime/**", ".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": ["DEV-000109 research contracts", "DEV-000110 citation resolver"], "may_change": ["Typed Truth bundle contracts and pure compiler"]},
+  "semantic_owner": "epistemics",
+  "canonical_state": ["Typed TruthBundle value only; persistence follows"],
+  "state_transitions": ["source chain -> observed observation -> unverified claim -> provisional/conflicted belief"],
+  "side_effects_and_privileges": ["Pure compiler; no fetching, external mutation or authority grant"],
+  "persistence_and_migrations": ["Truth persistence is a later task"],
+  "failure_retry_restart": ["Broken source chain rejects; conflict remains visible"],
+  "assumptions": ["Research executor will supply exact source snapshots/excerpts"],
+  "acceptance_scenarios": ["Observation/claim/citation refs align", "Conflict produces CONFLICTED belief", "Broken source chain is rejected"],
+  "required_tests": ["go test ./...", "go vet ./...", "preflight", "check-diff", "check-architecture", "independent", "git diff --check"],
+  "terminal_gap_states": ["BLOCKED_BY_SPEC_GAP", "BLOCKED_BY_CONFLICT"]
+}
diff --git a/modules/epistemics/domain/truth.go b/modules/epistemics/domain/truth.go
new file mode 100644
index 0000000..3b9a1a0
--- /dev/null
+++ b/modules/epistemics/domain/truth.go
@@ -0,0 +1,31 @@
+package domain
+
+import (
+	"errors"
+	"strings"
+
+	"git.cin.su/m/Assistant/contracts/epistemics"
+)
+
+var ErrInvalidTruthBundle = errors.New("invalid truth bundle")
+
+func CompileObservedClaim(source epistemics.Source, snapshot epistemics.SourceSnapshot, excerpt epistemics.SourceExcerpt, statement string, observedAt int64, conflict epistemics.ConflictState) (epistemics.TruthBundle, error) {
+	if strings.TrimSpace(statement) == "" || observedAt < 1 {
+		return epistemics.TruthBundle{}, ErrInvalidTruthBundle
+	}
+	citation, err := epistemics.ResolveCitation(source, snapshot, excerpt, epistemics.EvidenceObserved, epistemics.CoverageComplete, conflict, observedAt)
+	if err != nil {
+		return epistemics.TruthBundle{}, ErrInvalidTruthBundle
+	}
+	observation := epistemics.Observation{ID: epistemics.ObservationID("observation:" + string(excerpt.ID)), SourceSnapshot: snapshot.ID, Excerpt: excerpt.ID, Text: excerpt.Text, ObservedAt: observedAt}
+	claim := epistemics.Claim{ID: epistemics.ClaimID("claim:" + string(excerpt.ID)), Statement: statement, ObservationID: observation.ID, CitationID: citation.ID, Verification: epistemics.VerificationUnverified}
+	state := epistemics.BeliefProvisional
+	if conflict == epistemics.ConflictPresent || conflict == epistemics.ConflictUnknown {
+		state = epistemics.BeliefConflicted
+	}
+	bundle := epistemics.TruthBundle{Observation: observation, Claim: claim, Belief: epistemics.Belief{ID: epistemics.BeliefID("belief:" + string(excerpt.ID)), ClaimID: claim.ID, State: state}, Citation: citation}
+	if bundle.Observation.SourceSnapshot != snapshot.ID || bundle.Claim.ObservationID != bundle.Observation.ID || bundle.Claim.CitationID != bundle.Citation.ID || bundle.Belief.ClaimID != bundle.Claim.ID {
+		return epistemics.TruthBundle{}, ErrInvalidTruthBundle
+	}
+	return bundle, nil
+}
diff --git a/tests/research_contracts/truth_bundle_test.go b/tests/research_contracts/truth_bundle_test.go
new file mode 100644
index 0000000..c972185
--- /dev/null
+++ b/tests/research_contracts/truth_bundle_test.go
@@ -0,0 +1,27 @@
+package research_contracts_test
+
+import (
+	"testing"
+
+	"git.cin.su/m/Assistant/contracts/epistemics"
+	episdomain "git.cin.su/m/Assistant/modules/epistemics/domain"
+)
+
+func TestCompileObservedClaimPreservesEvidenceChainAndConflict(t *testing.T) {
+	source := epistemics.Source{ID: "source-1", Locator: "https://example.test/source"}
+	snapshot := epistemics.SourceSnapshot{ID: "snapshot-1", SourceID: source.ID, ContentDigest: "sha256:test", CapturedAtUnixMillis: 100, Freshness: epistemics.FreshnessCurrent}
+	excerpt := epistemics.SourceExcerpt{ID: "excerpt-1", SnapshotID: snapshot.ID, Text: "exact observation", Start: 0, End: 17}
+	bundle, err := episdomain.CompileObservedClaim(source, snapshot, excerpt, "The observed fact is true", 200, epistemics.ConflictPresent)
+	if err != nil || bundle.Claim.ObservationID != bundle.Observation.ID || bundle.Belief.State != epistemics.BeliefConflicted || bundle.Citation.Evidence != epistemics.EvidenceObserved {
+		t.Fatalf("invalid truth bundle: %#v %v", bundle, err)
+	}
+}
+
+func TestCompileObservedClaimRejectsBrokenSourceChain(t *testing.T) {
+	source := epistemics.Source{ID: "source-1", Locator: "https://example.test/source"}
+	snapshot := epistemics.SourceSnapshot{ID: "snapshot-1", SourceID: "other-source", ContentDigest: "sha256:test", CapturedAtUnixMillis: 100, Freshness: epistemics.FreshnessCurrent}
+	excerpt := epistemics.SourceExcerpt{ID: "excerpt-1", SnapshotID: snapshot.ID, Text: "exact observation", Start: 0, End: 17}
+	if _, err := episdomain.CompileObservedClaim(source, snapshot, excerpt, "statement", 200, epistemics.ConflictNone); err != episdomain.ErrInvalidTruthBundle {
+		t.Fatalf("broken chain was accepted: %v", err)
+	}
+}