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doc: Add documentation for ELF app metadata syscalls 76 and 77

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8
docs/appdev/syscalls.md
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@ -131,6 +131,13 @@ Notes:
| 74 | `SYSTEM_CMD_SIGPROCMASK` | Signal mask ops |
| 75 | `SYSTEM_CMD_SIGPENDING` | Get pending signals |
### ELF app metadata
| ID | Macro | Meaning |
|---|---|---|
| 76 | `SYSTEM_CMD_GET_ELF_METADATA` | Read full app metadata from an ELF |
| 77 | `SYSTEM_CMD_GET_ELF_PRIMARY_IMAGE` | Read primary icon path from an ELF |
## Common Wrapper API (`src/userland/libc/syscall.h`)
Typical wrappers used by apps:
@ -138,6 +145,7 @@ Typical wrappers used by apps:
- Filesystem: `sys_open`, `sys_read`, `sys_write_fs`, `sys_close`, `sys_seek`, `sys_tell`, `sys_size`, `sys_list`
- Network: `sys_network_init`, `sys_network_dhcp_acquire`, `sys_udp_send`, `sys_tcp_connect`, `sys_tcp_recv_nb`, `sys_dns_lookup`
- TTY: `sys_tty_create`, `sys_tty_read_out`, `sys_tty_write_in`, `sys_tty_set_fg`
- ELF metadata: `sys_get_elf_metadata`, `sys_get_elf_primary_image` — see [`elf_metadata.md`](elf_metadata.md) for full usage
## Best Practices