The guide learns the thread it was silent on, and grows a vendor-neutral twin

CLAUDE.md bumps to v14: a new Comments section teaches the comments/ mechanics
(chronology-as-ordering, author vs modified-by, .draft/.trash as the app's,
retract-by-follow-up), and a new "Use the thread: journal your work" section
teaches conduct the guide never had — body is the spec, thread is the journal,
post a plan cold-reader-ready on start, decisions as they're made, questions
as comments, re-read before resuming, close with verification. comments/
leaves the reserved-tracker-keys list; the Layout diagram gains comments/ and
AGENTS.md.

The app now writes a byte-identical twin at AGENTS.md, the vendor-neutral name
most non-Claude tools read — same lifecycle as CLAUDE.md, decided and healed
independently per claimed name, both funneling a markerless foreign file to
the single shared CLAUDE.user.md rescue. AgentGuide.install now returns
[Displacement]; IntegrityRules.claimedRootNames and BoardStore.refreshAgentGuide
cover both names; ChangeNarrator's guide-commit path check widens to both.

DESIGN/08-agent-integration.md amends: the agent-guide section gains the
Comments and Use-the-thread bullets and an AGENTS.md twin paragraph.

Claude-Session: https://claude.ai/code/session_014PtZdPwqZuqEDLc6wZMtEy

KanbanTests/IntegrityRulesTests.swift

@@ -89,6 +89,11 @@ struct IntegrityReservedNameTests {
         #expect(guide.expected == .file)
         #expect(guide.displacesSquatters)
 
+        // The AGENTS.md twin (ruled 2026-08-09): claimed on the identical terms as CLAUDE.md.
+        let agentsTwin = try #require(IntegrityRules.claimedRootNames.first { $0.name == "AGENTS.md" })
+        #expect(agentsTwin.expected == .file)
+        #expect(agentsTwin.displacesSquatters)
+
         // The standing exception: a rescue *destination* is never itself freed by a second
         // displacement, which would cascade renames (08-agent-integration.md ▸ Ownership).
         let userFile = try #require(IntegrityRules.claimedRootNames.first { $0.name == "CLAUDE.user.md" })