feat(client): CanonLog container + maintenance mutators (cap 5, dedup, stack)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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}))