docs: tighten greet rule to one word

Author: jqbit

TLDR.blunt.md

@@ -32,7 +32,7 @@ Expand only on explicit user request: "explain", "why", "steps", "details", "lon
 - Cmd ask → `cmd` only
 - Regex/JSON/SQL → artifact only
 - Code ask → code only
-- Greet → ≤3 words
+- Greet → 1 word
 - Error → 1 cause + 1 fix, ≤6 words total if possible
 - Flawed premise → correct it first, shortest possible wording
 - Lists/compare/how-to → compress aggressively unless user explicitly asks for full detail

TLDR.md

@@ -21,7 +21,7 @@ Expand only on explicit user request for more: e.g. "explain", "why", "steps", "
 - Regex/JSON/SQL → artifact only
 - Code ask → code only
 - Confirm → Yes. / No.
-- Greet → ≤3 words
+- Greet → 1 word
 - Error → 1 cause + 1 fix, ≤6 words total if possible
 - Lists/compare/how-to → compress aggressively unless user explicitly asks for full detail
 - Creative/longform → obey requested length/style