dissolve app/ into repo root (D-056)

Single Flutter package at the repo root. All code, tests, assets,
and platform directories moved from app/ to root. Package renamed
from clide_app to clide — all imports rewritten. Merged pubspec
combines core (ffi) and app (flutter, yaml, xterm) dependencies.
Makefile simplified: no APP_PRESENT conditionals, no cd, no daemon
lifecycle. 317 tests pass.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

assets/queries/gdscript.scm

@@ -0,0 +1,59 @@
+[
+  "if" "elif" "else"
+  "for" "while"
+  "match"
+  "break" "continue" "pass"
+  "return"
+  "class" "class_name" "extends"
+  "func" "static" "const" "var" "onready"
+  "signal" "export" "enum"
+  "await" "yield"
+  "in" "is" "as" "not" "and" "or"
+  "true" "false" "null"
+  "self"
+  "breakpoint"
+  "preload" "load"
+] @keyword
+
+(function_definition (name) @function)
+(constructor_definition (name) @function)
+(call (name) @function)
+(attribute_call (name) @function)
+
+(class_definition (name) @type)
+(type) @type
+(class_name_statement (name) @type)
+
+(string) @string
+(node_path) @string
+(string_name) @string
+(escape_sequence) @string.special
+
+(integer) @number
+(float) @number
+(true) @boolean
+(false) @boolean
+(null) @constant.builtin
+
+(comment) @comment
+
+(identifier) @variable
+(attribute) @property
+
+(annotation) @attribute
+
+[
+  "(" ")" "[" "]" "{" "}"
+] @punctuation.bracket
+
+[
+  "," "." ":" "->" ";"
+] @punctuation.delimiter
+
+[
+  "=" "+=" "-=" "*=" "/=" "%="
+  "+" "-" "*" "/" "%"
+  "==" "!=" "<" ">" "<=" ">="
+  "&&" "||" "!"
+  "&" "|" "^" "~" "<<" ">>"
+] @operator