Mattermost webapp architecture vault initial scaffold\n\nCreated an Obsidian-ready vault at docs/webapp-vault.\n\nKey outputs:\n- README and STATUS.\n- Architecture docs for system map, runtime bootstrap, Redux state, routing, networking, build/workspaces.\n- Source critical path walk from root.html/root.tsx/entry.tsx through Root, TeamController, ChannelView, PostView, PostList.\n- PM operating rules and task graph for parallel worker sessions.\n- Worker packets A/B/F.\n- Generated inventory: 8,544 files and 1,164 folders.\n\nVerification:\n- node docs/webapp-vault/tools/generate_inventory.mjs succeeded.\n- node --check generator succeeded.\n- Markdown code fence balance check found no issues.\n\nNo app runtime code changed.