chore: land tree view-state, vault, Pi module split, and repo hygiene

Persist PageTree expand state via control-plane view-state and align
chevron/DOM with restored expansion; keep Sidex-style shallow page-tree
scan and drop the unused recursive scanner that only added cargo noise.

Add password vault workbench routes/runtime/skill/CLI, split page_ai_pi
into a module package, and retire Hermes/ACP/OpenHub recycle + root
harness evidence from the index while gitignoring recycle and local
diag dumps.

Archive superseded design/bugs docs under old/, point architecture at
ARCHITECTURE.md, and refresh smokes for Pi S1–S7, vault, and editor
regressions so the working tree can stay clean.

rust/crates/mnote-web/Cargo.toml

@@ -23,7 +23,7 @@ serde_json = "1"
 tokio = { version = "1", features = ["macros", "rt-multi-thread", "net", "signal", "sync", "time", "process", "io-util"] }
 tokio-stream = { version = "0.1", features = ["sync"] }
 tokio-tungstenite = "0.29"
-tower-http = { version = "0.6", features = ["trace"] }
+tower-http = { version = "0.6", features = ["trace", "compression-gzip", "compression-br"] }
 tracing = "0.1"
 tracing-subscriber = { version = "0.3", features = ["fmt"] }
 tower = "0.5"