feat(php-shim): implement fopen-family stream API on PhpResource

Redesign PhpResource into a real stream handle (File/Memory backing with
tracked position, eof, closed state) and unify the whole fopen family
(fopen/fwrite/fread/fgets/fgetc/feof/fclose/ftell/fseek/rewind/fstat/
ftruncate/fflush and stream_get_contents/stream_copy_to_stream) on
&PhpResource, replacing the split PhpMixed/PhpResource APIs and their
todo!() stubs. fopen now returns Result; read functions stay String for
now (TODO(phase-e) to move to byte strings).

Propagate the signatures through callers: Process stdout/stderr, Cursor
input, curl header/body handles (extracted into typed maps keyed by job
id), Filesystem copy/safe_copy/files_are_equal, BufferIO, error_handler,
platform, perforce, zip. The proc_open pipe paths cannot carry a
PhpResource in a PhpMixed list, so they are left as todo!() with notes.

1 files changed, 1 insertions, 1 deletions

diff --git a/crates/shirabe-php-shim/src/zip.rs b/crates/shirabe-php-shim/src/zip.rs
index 1258c3d..5ef99bb 100644
--- a/crates/shirabe-php-shim/src/zip.rs
+++ b/crates/shirabe-php-shim/src/zip.rs
@@ -49,7 +49,7 @@ impl ZipArchive {
         todo!()
     }
 
-    pub fn get_stream(&self, _name: &str) -> Option<PhpMixed> {
+    pub fn get_stream(&self, _name: &str) -> Option<crate::PhpResource> {
         todo!()
     }