feature: preemptive process management - implementation progress

Implement a preemptive multitasking system for the Asuro kernel.

Context Switching & Scheduling:
- Custom IRQ0 ISR (contextswitcher.pas) with PUSHAD/POPAD ESP-swap
- Round-robin scheduler with priority-based quantum
- Process table using DList of PProcessContext pointers
- Idle process (PID 0) replaces kernel HLT loop

Process Lifecycle:
- create/kill/terminate/sendMessage API (processmanager.pas)
- Process states: Created, Running, Ready, Suspended, Awaiting,
  Finished, Error
- Parent-child tracking (ParentID, smChildExited notification on reap)
- proc_yield, proc_sleep_ms, proc_await, proc_suspend, proc_exit

Resource Binding & Cleanup:
- Per-process resource list
  (bindResource/unbindResource/unbindAllResources)
- TCP sockets auto-bound to owning process (OwnerPID on TTCPSocket)
- socket_cleanup + auto-unbind in DestroySocket

VTerminal Refactor:
- Multi-instance design (heap-allocated TVTermState per terminal)
- Foreground process with incremental stdout/stderr drain via LVGL timer
- Ctrl+C kills foreground process (killForeground)
- Per-terminal CWD, dir stack, FS builtins (CD/LS/PUSHD/POPD)
- Background job support (& suffix, JOBS/FG commands)
- Command history (Up/Down arrow)

Command Consolidation:
- 14 commands extracted from 9 units into centralized progmanager.pas
- Command procedures exported in host unit interfaces
- E1000/TRACER/stdio builtins kept in-place (conditional/circular)

New Units:
- src/include/proctypes.pas — process type definitions
- src/processmanager.pas — core process manager
- src/prog/ping.pas — standalone ICMP ping process
- src/prog/testcmd.pas — test command (proc_sleep_ms demo)
- src/testprocs.pas — process subsystem smoke tests

Misc:
- ICMP callbacks gain userData parameter for concurrency-safe ping
- CLI/STI guards on kalloc/kfree (lmemorymanager.pas)
- LV_KEY_CTRLC constant + Ctrl+C interception in LVGL keyboard hook
- Window owner PID tracking (windows.pas)
- ISR_32 gate override support (isrmanager.pas)

src/contextswitcher.pas

@@ -29,11 +29,14 @@ unit contextswitcher;
 interface
 
 uses
-    idt, isrmanager, processmanager, proctypes, util, tracer;
+    idt, isrmanager, processmanager, proctypes, util, syslog, tracer;
 
 { Initialise: overwrite IDT gate 32 with our custom ISR. }
 procedure init;
 
+{ No idle ESP variable needed — idle is now a formal process (PID 0)
+  with its SavedESP managed like any other process. }
+
 implementation
 
 { -----------------------------------------------------------------------

src/driver/storage/vfs.pas

@@ -82,6 +82,10 @@ function GetDirectoryListingFrom(Path : pchar; BaseDir : pchar) : PHashMap;
 procedure FreeDirectoryListing(map : PHashMap);
 function changeDirectoryFrom(Path : pchar; BaseDir : pchar; var NewDir : pchar) : TIsPathValid;
 function MakeAbsolutePath(Path : PChar) : pchar;
+function makeAbsolutePathFrom(Path : pchar; BaseDir : pchar) : pchar;
+function resolvePathFrom(Path : pchar; BaseDir : pchar) : TIsPathValid;
+function GetDirectoryListingFrom(Path : pchar; BaseDir : pchar) : PHashMap;
+function changeDirectoryFrom(Path : pchar; BaseDir : pchar; var NewDir : pchar) : TIsPathValid;
 
 //VFS Functions
 function newVirtualDirectory(Path : pchar) : TError;