diff --git a/client/scripts/canon_log/canon_log.gd b/client/scripts/canon_log/canon_log.gd
new file mode 100644
index 0000000..7fe7c9d
--- /dev/null
+++ b/client/scripts/canon_log/canon_log.gd
@@ -0,0 +1,101 @@
+class_name CanonLog
+extends RefCounted
+## The §11 canon log: compact structured state code maintains and injects into
+## every AI call. This container owns the container-level invariants; leaf rows
+## own theirs. AI prose never writes here directly — mutators are called by code.
+
+const SCHEMA_VERSION := 1
+const MAX_RECENT_EVENTS := 5
+
+var schema_version: int = SCHEMA_VERSION
+var player: LogPlayer
+var location: LogLocation
+var party: Array[PartyMember] = []
+var recent_events: Array[String] = []
+var established_facts: Array[String] = []
+var active_quests: Array[Quest] = []
+var humiliations: Array[Humiliation] = []
+
+
+func _init() -> void:
+	player = LogPlayer.new()
+	location = LogLocation.new()
+
+
+# ── maintenance mutators (charter §11 maintenance table) ─────────────────────
+
+func push_event(line: String) -> void:
+	recent_events.append(line)
+	while recent_events.size() > MAX_RECENT_EVENTS:
+		recent_events.pop_front()
+
+
+func add_fact(text: String) -> void:
+	if text not in established_facts:
+		established_facts.append(text)
+
+
+func add_humiliation(id: String, text: String, weight: int, turn: int) -> void:
+	humiliations.append(Humiliation.new(id, text, weight, turn))
+
+
+func set_location(id: String, name: String) -> void:
+	location = LogLocation.new(id, name)
+
+
+func party_member(id: String) -> PartyMember:
+	for m in party:
+		if m.id == id:
+			return m
+	return null
+
+
+func adjust_disposition(id: String, delta: int) -> bool:
+	var m := party_member(id)
+	if m == null:
+		return false
+	m.set_disposition(m.disposition + delta)
+	return true
+
+
+func set_quest_status(id: String, status: String) -> bool:
+	for q in active_quests:
+		if q.id == id:
+			return q.set_status(status)
+	return false
+
+
+# ── serialisation ────────────────────────────────────────────────────────────
+
+func to_dict() -> Dictionary:
+	return {
+		"schema_version": schema_version,
+		"player": player.to_dict(),
+		"location": location.to_dict(),
+		"party": party.map(func(m): return m.to_dict()),
+		"recent_events": recent_events.duplicate(),
+		"established_facts": established_facts.duplicate(),
+		"active_quests": active_quests.map(func(q): return q.to_dict()),
+		"humiliations": humiliations.map(func(h): return h.to_dict()),
+	}
+
+
+static func from_dict(d: Dictionary) -> CanonLog:
+	var v := int(d.get("schema_version", -1))
+	if v != SCHEMA_VERSION:
+		push_error("unsupported canon_log schema_version: %s" % v)
+		return null
+	var log := CanonLog.new()
+	log.player = LogPlayer.from_dict(d.get("player", {}))
+	log.location = LogLocation.from_dict(d.get("location", {}))
+	for m in d.get("party", []):
+		log.party.append(PartyMember.from_dict(m))
+	for e in d.get("recent_events", []):
+		log.push_event(e)
+	for f in d.get("established_facts", []):
+		log.add_fact(f)
+	for q in d.get("active_quests", []):
+		log.active_quests.append(Quest.from_dict(q))
+	for h in d.get("humiliations", []):
+		log.humiliations.append(Humiliation.from_dict(h))
+	return log
diff --git a/client/scripts/canon_log/canon_log.gd.uid b/client/scripts/canon_log/canon_log.gd.uid
new file mode 100644
index 0000000..b6e2548
--- /dev/null
+++ b/client/scripts/canon_log/canon_log.gd.uid
@@ -0,0 +1 @@
+uid://b1crmy8ma5ig4
diff --git a/client/tests/unit/test_canon_log.gd b/client/tests/unit/test_canon_log.gd
new file mode 100644
index 0000000..aa7235c
--- /dev/null
+++ b/client/tests/unit/test_canon_log.gd
@@ -0,0 +1,48 @@
+extends "res://addons/gut/test.gd"
+
+const CanonLog = preload("res://scripts/canon_log/canon_log.gd")
+const PartyMember = preload("res://scripts/canon_log/party_member.gd")
+const Quest = preload("res://scripts/canon_log/quest.gd")
+
+
+func test_push_event_caps_at_five():
+	var log = CanonLog.new()
+	for i in 7:
+		log.push_event("event %d" % i)
+	assert_eq(log.recent_events.size(), 5)
+	assert_eq(log.recent_events[0], "event 2")
+	assert_eq(log.recent_events[4], "event 6")
+
+
+func test_add_fact_dedups():
+	var log = CanonLog.new()
+	log.add_fact("the bridge is out")
+	log.add_fact("the bridge is out")
+	assert_eq(log.established_facts.size(), 1)
+
+
+func test_humiliations_stack():
+	var log = CanonLog.new()
+	log.add_humiliation("h_1", "vomited on a shrine", 7, 3)
+	log.add_humiliation("h_2", "vomited on a shrine", 7, 5)
+	assert_eq(log.humiliations.size(), 2)
+
+
+func test_adjust_disposition_clamps_and_reports_missing():
+	var log = CanonLog.new()
+	log.party.append(PartyMember.new("brannoc_thane", "Brannoc Thane", 98))
+	assert_true(log.adjust_disposition("brannoc_thane", 50))
+	assert_eq(log.party_member("brannoc_thane").disposition, 100)
+	assert_false(log.adjust_disposition("nobody", 5))
+
+
+func test_set_quest_status_rejects_bad_enum():
+	var log = CanonLog.new()
+	log.active_quests.append(Quest.new("find_the_ledger", "The Missing Ledger", "active", "Find it"))
+	assert_false(log.set_quest_status("find_the_ledger", "abandoned"))
+	assert_true(log.set_quest_status("find_the_ledger", "complete"))
+	assert_false(log.set_quest_status("no_quest", "active"))
+
+
+func test_unsupported_schema_version_returns_null():
+	assert_null(CanonLog.from_dict({"schema_version": 2}))
diff --git a/client/tests/unit/test_canon_log.gd.uid b/client/tests/unit/test_canon_log.gd.uid
new file mode 100644
index 0000000..3c726e9
--- /dev/null
+++ b/client/tests/unit/test_canon_log.gd.uid
@@ -0,0 +1 @@
+uid://cc3ax10wjoqx6