fix(wing,server): client names are matched as whole Unicode words; unsafe lists are a startup error (review of #214)

- WrapNames bounds the bare name list with Unicode-aware edges instead of \b
  (Go's \b is ASCII-only, so a name with a non-ASCII edge letter such as Åke,
  Société, Ørsted would never have matched), and validates the list on its own:
  it must compile, must not match the empty string, and cannot break out of its
  group ('x)|.*(' compiles alone only if balanced)
- NewRouter refuses any pattern that matches text naming no client
- docs state the whole-word semantics and what is not matched
Mutation-checked. Open decision for Mathias: whole-word versus substring recall
for a confidentiality filter (plurals, CamelCase and digits glued on do not match).

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

docs/raw-inbox.md

@@ -33,7 +33,7 @@ deployment:
 |---|---|
 | `INGEST_WING_ROUTING` | `1`/`true` enables the rules above; unset or `0`/`false` is off; any other value stops the server at startup |
 | `INGEST_DEFAULT_WING` | wing for unsignalled notes (default `web-clip`; must be a plain name, not `sources`/`concepts`/`entities`/`wiki`) |
-| `INGEST_CLIENT_BLOCK` | case-insensitive regexp over note text; a match parks an unsignalled note. Falls back to `CLAUDE_INGEST_CLIENT_BLOCK`. Matched after folding fullwidth letters, removing zero-width characters, normalising dashes and removing whitespace. Patterns with spaces, `\\s` or `\\b` work (whitespace is collapsed in one view and removed in another). It catches what it names and nothing else: leetspeak, punctuation splits (`a.c.m.e`), encodings and homoglyphs outside a small Cyrillic/Greek table are not caught. Large notes are checked in 1 MiB chunks |
+| `INGEST_CLIENT_BLOCK` | case-insensitive regexp over note text; a match parks an unsignalled note. Falls back to `CLAUDE_INGEST_CLIENT_BLOCK`, which the deployment injects as a bare list of client names (`acme|globex`): it is then matched as whole names, with word edges decided by Unicode letters and digits (an underscore or punctuation is a boundary, so `trucker_ecommerce` matches `trucker`; `acmecorp`, `acme2` and plurals do not), and a list that is not a valid regexp, has an empty alternative, or could break out of its group stops the server at startup. A full pattern that matches the empty string is refused at startup too. Matched after folding fullwidth letters, removing zero-width characters, normalising dashes and removing whitespace. Patterns with spaces, `\\s` or `\\b` work (whitespace is collapsed in one view and removed in another). It catches what it names and nothing else: leetspeak, punctuation splits (`a.c.m.e`), encodings and homoglyphs outside a small Cyrillic/Greek table are not caught. Large notes are checked in 1 MiB chunks |
 
 A bad default or pattern stops the server at startup. A wing created while the
 server runs is usable without a restart.