Commit the concurrent session's pending web and docs work

Not my work. These nine files sat uncommitted in the shared checkout
while another session worked on them, and the UI redesign that follows
rewrites web/src/main.tsx and web/src/style.css. Committing first means
that work is recoverable rather than overwritten.

Contents, by inspection rather than by authorship: whitespace
normalisation and edits across main.tsx, 568 added lines of style.css,
client and client test changes, the orchestra-user line in build.sh, and
docs updates to AGENTS.md, AUDIT.md, DEPLOYMENT.md and the env example.

Committed at the operator's explicit instruction.

deploy/orchestra.env.example

@@ -139,12 +139,11 @@ ORCHESTRA_CONTEXT_WINDOW=200000
 # --- Bus authorization tokens (bearer auth per surface; a surface with no
 # token set has no auth requirement — set these once you have real clients) ---
 #ORCHESTRA_TUI_TOKEN=
-# Required: the service refuses to start without both. The browser UI's
-# task, lifecycle and approval controls are session-gated; it no longer
-# accepts a shared Web bearer token. Generate the bcrypt hash with:
-#   go run ./cmd/orchestra-password
-ORCHESTRA_WEB_USERNAME=operator
-ORCHESTRA_WEB_PASSWORD_HASH=
+# Browser operators are stored in $ORCHESTRA_DATA/auth.db, not in this file.
+# With Orchestra stopped, create or reset one interactively with:
+#   orchestra-user set -data /data -username kami
+# Existing ORCHESTRA_WEB_USERNAME + ORCHESTRA_WEB_PASSWORD_HASH values are
+# imported once only when auth.db contains no users, then should be removed.
 # Set when the UI is served over plain HTTP, so the session cookie can be
 # sent without Secure. Leave unset behind TLS.
 #ORCHESTRA_UI_INSECURE_COOKIE=1